21092074939 has 8 divisors (see below), whose sum is σ = 22768759440. Its totient is φ = 19423135776.

The previous prime is 21092074931. The next prime is 21092074961. The reversal of 21092074939 is 93947029012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21092074939 - 2³ = 21092074931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21092074931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1930672 + ... + 1941565.

It is an arithmetic number, because the mean of its divisors is an integer number (2846094930).

Almost surely, 2^21092074939 is an apocalyptic number.

21092074939 is a deficient number, since it is larger than the sum of its proper divisors (1676684501).

21092074939 is a wasteful number, since it uses less digits than its factorization.

21092074939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872669.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 21092074939 in words is "twenty-one billion, ninety-two million, seventy-four thousand, nine hundred thirty-nine".