21573465123 has 32 divisors (see below), whose sum is σ = 33347635200. Its totient is φ = 12150567936.

The previous prime is 21573465097. The next prime is 21573465131. The reversal of 21573465123 is 32156437512.

It is not a de Polignac number, because 21573465123 - 2¹² = 21573461027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21573465923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 972823 + ... + 994751.

It is an arithmetic number, because the mean of its divisors is an integer number (1042113600).

Almost surely, 2^21573465123 is an apocalyptic number.

21573465123 is a deficient number, since it is larger than the sum of its proper divisors (11774170077).

21573465123 is a wasteful number, since it uses less digits than its factorization.

21573465123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22611.

The product of its digits is 151200, while the sum is 39.

The spelling of 21573465123 in words is "twenty-one billion, five hundred seventy-three million, four hundred sixty-five thousand, one hundred twenty-three".