21121122021100 has 18 divisors (see below), whose sum is σ = 45832834786004. Its totient is φ = 8448448808400.

The previous prime is 21121122021029. The next prime is 21121122021113. The reversal of 21121122021100 is 112022112112.

It is a super-2 number, since 2×21121122021100² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105605610006 + ... + 105605610205.

Almost surely, 2^{21121122021100} is an apocalyptic number.

21121122021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121122021100 is an abundant number, since it is smaller than the sum of its proper divisors (24711712764904).

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

21121122021100 is a wasteful number, since it uses less digits than its factorization.

21121122021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211211220225 (or 211211220218 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21121122021100 its reverse (112022112112), we get a palindrome (21233144133212).

The spelling of 21121122021100 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-two million, twenty-one thousand, one hundred".