21995282439 has 12 divisors (see below), whose sum is σ = 34214883976. Its totient is φ = 13535558352.

The previous prime is 21995282401. The next prime is 21995282443. The reversal of 21995282439 is 93428259912.

21995282439 is a `hidden beast` number, since 2 + 1 + 99 + 528 + 24 + 3 + 9 = 666.

It is not a de Polignac number, because 21995282439 - 2²¹ = 21993185287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21995282039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93996817 + ... + 93997050.

Almost surely, 2^21995282439 is an apocalyptic number.

21995282439 is a deficient number, since it is larger than the sum of its proper divisors (12219601537).

21995282439 is a wasteful number, since it uses less digits than its factorization.

21995282439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187993886 (or 187993883 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The spelling of 21995282439 in words is "twenty-one billion, nine hundred ninety-five million, two hundred eighty-two thousand, four hundred thirty-nine".