1012212121100 has 72 divisors (see below), whose sum is σ = 2221749673920. Its totient is φ = 400232926720.

The previous prime is 1012212121093. The next prime is 1012212121103. The reversal of 1012212121100 is 11212122101.

It is a super-2 number, since 2×1012212121100² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1012212121103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41257037 + ... + 41281563.

It is an arithmetic number, because the mean of its divisors is an integer number (30857634360).

Almost surely, 2^{1012212121100} is an apocalyptic number.

1012212121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1012212121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1110874836960).

1012212121100 is an abundant number, since it is smaller than the sum of its proper divisors (1209537552820).

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

1012212121100 is a wasteful number, since it uses less digits than its factorization.

1012212121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29267 (or 29260 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1012212121100 its reverse (11212122101), we get a palindrome (1023424243201).

The spelling of 1012212121100 in words is "one trillion, twelve billion, two hundred twelve million, one hundred twenty-one thousand, one hundred".