1021211221110 has 32 divisors (see below), whose sum is σ = 2451539375712. Its totient is φ = 272252720640.

The previous prime is 1021211221103. The next prime is 1021211221123. The reversal of 1021211221110 is 111221121201.

It is a happy number.

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 1021211221110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4273731 + ... + 4506350.

It is an arithmetic number, because the mean of its divisors is an integer number (76610605491).

Almost surely, 2^{1021211221110} is an apocalyptic number.

1021211221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021211221110 is an abundant number, since it is smaller than the sum of its proper divisors (1430328154602).

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

1021211221110 is a wasteful number, since it uses less digits than its factorization.

1021211221110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8783968.

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

Adding to 1021211221110 its reverse (111221121201), we get a palindrome (1132432342311).

Subtracting from 1021211221110 its reverse (111221121201), we obtain a palindrome (909990099909).

It can be divided in two parts, 102121 and 1221110, that added together give a palindrome (1323231).

The spelling of 1021211221110 in words is "one trillion, twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, one hundred ten".