21123221010000 has 100 divisors (see below), whose sum is σ = 68188573946592. Its totient is φ = 5632858928000.

The previous prime is 21123221009977. The next prime is 21123221010029. The reversal of 21123221010000 is 1012232112.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 352023684 + ... + 352083683.

Almost surely, 2^{21123221010000} is an apocalyptic number.

21123221010000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21123221010000 is an abundant number, since it is smaller than the sum of its proper divisors (47065352936592).

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

21123221010000 is an equidigital number, since it uses as much as digits as its factorization.

21123221010000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704107398 (or 704107377 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21123221010000 its reverse (1012232112), we get a palindrome (21124233242112).

The spelling of 21123221010000 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred twenty-one million, ten thousand".