21121011200120 has 64 divisors (see below), whose sum is σ = 52045255836000. Its totient is φ = 7666348773888.

The previous prime is 21121011200111. The next prime is 21121011200207. The reversal of 21121011200120 is 2100211012112.

It is a super-2 number, since 2×21121011200120² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121011200095 and 21121011200104.

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, 344183975 + ... + 344245334.

Almost surely, 2^{21121011200120} is an apocalyptic number.

21121011200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121011200120 is an abundant number, since it is smaller than the sum of its proper divisors (30924244635880).

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

21121011200120 is a wasteful number, since it uses less digits than its factorization.

21121011200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688429392 (or 688429388 counting only the distinct ones).

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

Adding to 21121011200120 its reverse (2100211012112), we get a palindrome (23221222212232).

The spelling of 21121011200120 in words is "twenty-one trillion, one hundred twenty-one billion, eleven million, two hundred thousand, one hundred twenty".