21892697539 has 4 divisors (see below), whose sum is σ = 21904179624. Its totient is φ = 21881215456.

The previous prime is 21892697521. The next prime is 21892697549. The reversal of 21892697539 is 93579629812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21892697539 - 2²⁵ = 21859143107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21892697509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5738182 + ... + 5741995.

It is an arithmetic number, because the mean of its divisors is an integer number (5476044906).

Almost surely, 2^21892697539 is an apocalyptic number.

21892697539 is a deficient number, since it is larger than the sum of its proper divisors (11482085).

21892697539 is a wasteful number, since it uses less digits than its factorization.

21892697539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11482084.

The product of its digits is 14696640, while the sum is 61.

The spelling of 21892697539 in words is "twenty-one billion, eight hundred ninety-two million, six hundred ninety-seven thousand, five hundred thirty-nine".