21123033321104 has 80 divisors (see below), whose sum is σ = 48082426277760. Its totient is φ = 8862502318080.

The previous prime is 21123033321067. The next prime is 21123033321133. The reversal of 21123033321104 is 40112333032112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72720992 + ... + 73010880.

It is an arithmetic number, because the mean of its divisors is an integer number (601030328472).

Almost surely, 2^{21123033321104} is an apocalyptic number.

It is an amenable number.

21123033321104 is an abundant number, since it is smaller than the sum of its proper divisors (26959392956656).

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

21123033321104 is a wasteful number, since it uses less digits than its factorization.

21123033321104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321768 (or 321762 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21123033321104 its reverse (40112333032112), we get a palindrome (61235366353216).

The spelling of 21123033321104 in words is "twenty-one trillion, one hundred twenty-three billion, thirty-three million, three hundred twenty-one thousand, one hundred four".