21121000220000 has 60 divisors (see below), whose sum is σ = 51960828740436. Its totient is φ = 8448400080000.

The previous prime is 21121000219997. The next prime is 21121000220017. The reversal of 21121000220000 is 2200012112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 528005006 + ... + 528045005.

Almost surely, 2^{21121000220000} is an apocalyptic number.

21121000220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121000220000 is an abundant number, since it is smaller than the sum of its proper divisors (30839828520436).

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

21121000220000 is an equidigital number, since it uses as much as digits as its factorization.

21121000220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056050041 (or 1056050018 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21121000220000 its reverse (2200012112), we get a palindrome (21123200232112).

The spelling of 21121000220000 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty thousand".