21121020011000 has 128 divisors (see below), whose sum is σ = 60828537893760. Its totient is φ = 6684454656000.

The previous prime is 21121020010963. The next prime is 21121020011023. The reversal of 21121020011000 is 11002012112.

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, 115958561 + ... + 116140560.

It is an arithmetic number, because the mean of its divisors is an integer number (475222952295).

Almost surely, 2^{21121020011000} is an apocalyptic number.

21121020011000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121020011000 is an abundant number, since it is smaller than the sum of its proper divisors (39707517882760).

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

21121020011000 is a wasteful number, since it uses less digits than its factorization.

21121020011000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232099162 (or 232099148 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21121020011000 its reverse (11002012112), we get a palindrome (21132022023112).

The spelling of 21121020011000 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, eleven thousand".