21303975123 has 12 divisors (see below), whose sum is σ = 31118167080. Its totient is φ = 14043069216.

The previous prime is 21303975103. The next prime is 21303975211. The reversal of 21303975123 is 32157930312.

It is a happy number.

21303975123 is a `hidden beast` number, since 2 + 130 + 3 + 9 + 7 + 512 + 3 = 666.

It is not a de Polignac number, because 21303975123 - 2³³ = 12714040531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21303975103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13297561 + ... + 13299162.

It is an arithmetic number, because the mean of its divisors is an integer number (2593180590).

Almost surely, 2^21303975123 is an apocalyptic number.

21303975123 is a deficient number, since it is larger than the sum of its proper divisors (9814191957).

21303975123 is a wasteful number, since it uses less digits than its factorization.

21303975123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26596818 (or 26596815 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The spelling of 21303975123 in words is "twenty-one billion, three hundred three million, nine hundred seventy-five thousand, one hundred twenty-three".