123319506921 has 32 divisors (see below), whose sum is σ = 180040143360. Its totient is φ = 74618668800.

The previous prime is 123319506913. The next prime is 123319506971. The reversal of 123319506921 is 129605913321.

It is not a de Polignac number, because 123319506921 - 2³ = 123319506913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123319506971) 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, 8416720 + ... + 8431358.

It is an arithmetic number, because the mean of its divisors is an integer number (5626254480).

Almost surely, 2^123319506921 is an apocalyptic number.

It is an amenable number.

123319506921 is a deficient number, since it is larger than the sum of its proper divisors (56720636439).

123319506921 is a wasteful number, since it uses less digits than its factorization.

123319506921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18257.

The product of its (nonzero) digits is 87480, while the sum is 42.

The spelling of 123319506921 in words is "one hundred twenty-three billion, three hundred nineteen million, five hundred six thousand, nine hundred twenty-one".