21121201020000 has 120 divisors (see below), whose sum is σ = 69281763782616. Its totient is φ = 5632320256000.

The previous prime is 21121201019981. The next prime is 21121201020047. The reversal of 21121201020000 is 2010212112.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×21121201020000² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 175950009 + ... + 176070008.

Almost surely, 2^{21121201020000} is an apocalyptic number.

21121201020000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121201020000 is an abundant number, since it is smaller than the sum of its proper divisors (48160562762616).

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

21121201020000 is an equidigital number, since it uses as much as digits as its factorization.

21121201020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352020050 (or 352020027 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21121201020000 its reverse (2010212112), we get a palindrome (21123211232112).

The spelling of 21121201020000 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred one million, twenty thousand".