21121011020000 has 60 divisors (see below), whose sum is σ = 51960855310056. Its totient is φ = 8448404400000.

The previous prime is 21121011019973. The next prime is 21121011020003. The reversal of 21121011020000 is 2011012112.

It is a super-2 number, since 2×21121011020000² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121011020003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 528005276 + ... + 528045275.

Almost surely, 2^{21121011020000} is an apocalyptic number.

21121011020000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121011020000 is an abundant number, since it is smaller than the sum of its proper divisors (30839844290056).

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

21121011020000 is an equidigital number, since it uses as much as digits as its factorization.

21121011020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056050581 (or 1056050558 counting only the distinct ones).

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

Adding to 21121011020000 its reverse (2011012112), we get a palindrome (21123022032112).

The spelling of 21121011020000 in words is "twenty-one trillion, one hundred twenty-one billion, eleven million, twenty thousand".