1021212121110 has 128 divisors (see below), whose sum is σ = 2527707506688. Its totient is φ = 263886336000.

The previous prime is 1021212121079. The next prime is 1021212121141. The reversal of 1021212121110 is 111212121201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1021212121079) and next prime (1021212121141).

It is a super-3 number, since 3×1021212121110³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1021212121110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 112327665 + ... + 112336755.

It is an arithmetic number, because the mean of its divisors is an integer number (19747714896).

Almost surely, 2^{1021212121110} is an apocalyptic number.

1021212121110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021212121110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1263853753344).

1021212121110 is an abundant number, since it is smaller than the sum of its proper divisors (1506495385578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021212121110 is a wasteful number, since it uses less digits than its factorization.

1021212121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9750.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1021212121110 its reverse (111212121201), we get a palindrome (1132424242311).

Subtracting from 1021212121110 its reverse (111212121201), we obtain a palindrome (909999999909).

The spelling of 1021212121110 in words is "one trillion, twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, one hundred ten".