21122021021112 has 128 divisors (see below), whose sum is σ = 64593337248000. Its totient is φ = 6341891137920.

The previous prime is 21122021021099. The next prime is 21122021021131. The reversal of 21122021021112 is 21112012022112.

21122021021112 is a `hidden beast` number, since 2 + 11 + 220 + 210 + 211 + 12 = 666.

It is a super-2 number, since 2×21122021021112² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40519638 + ... + 41037605.

It is an arithmetic number, because the mean of its divisors is an integer number (504635447250).

Almost surely, 2^{21122021021112} is an apocalyptic number.

21122021021112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21122021021112 is an abundant number, since it is smaller than the sum of its proper divisors (43471316226888).

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

21122021021112 is a wasteful number, since it uses less digits than its factorization.

21122021021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81557378 (or 81557368 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21122021021112 its reverse (21112012022112), we get a palindrome (42234033043224).

The spelling of 21122021021112 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, twenty-one thousand, one hundred twelve".