21423121139 has 16 divisors (see below), whose sum is σ = 24800256000. Its totient is φ = 18126659904.

The previous prime is 21423121123. The next prime is 21423121147. The reversal of 21423121139 is 93112132412.

It is a cyclic number.

It is not a de Polignac number, because 21423121139 - 2⁴ = 21423121123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21423124139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109262 + ... + 234060.

It is an arithmetic number, because the mean of its divisors is an integer number (1550016000).

Almost surely, 2^21423121139 is an apocalyptic number.

21423121139 is a deficient number, since it is larger than the sum of its proper divisors (3377134861).

21423121139 is a wasteful number, since it uses less digits than its factorization.

21423121139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125122.

The product of its digits is 2592, while the sum is 29.

The spelling of 21423121139 in words is "twenty-one billion, four hundred twenty-three million, one hundred twenty-one thousand, one hundred thirty-nine".