42921613923 has 32 divisors (see below), whose sum is σ = 60854587200. Its totient is φ = 26816188416.

The previous prime is 42921613913. The next prime is 42921613981. The reversal of 42921613923 is 32931612924.

It is not a de Polignac number, because 42921613923 - 2¹³ = 42921605731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42921613913) 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, 15388213 + ... + 15391001.

It is an arithmetic number, because the mean of its divisors is an integer number (1901705850).

Almost surely, 2^42921613923 is an apocalyptic number.

42921613923 is a deficient number, since it is larger than the sum of its proper divisors (17932973277).

42921613923 is a wasteful number, since it uses less digits than its factorization.

42921613923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991.

The product of its digits is 139968, while the sum is 42.

Subtracting from 42921613923 its reverse (32931612924), we obtain a palindrome (9990000999).

The spelling of 42921613923 in words is "forty-two billion, nine hundred twenty-one million, six hundred thirteen thousand, nine hundred twenty-three".