21395829087 has 24 divisors (see below), whose sum is σ = 31804214000. Its totient is φ = 13850455680.

The previous prime is 21395829083. The next prime is 21395829101. The reversal of 21395829087 is 78092859312.

21395829087 is a `hidden beast` number, since 21 + 39 + 582 + 9 + 0 + 8 + 7 = 666.

It is not a de Polignac number, because 21395829087 - 2² = 21395829083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21395829083) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101787 + ... + 230547.

Almost surely, 2^21395829087 is an apocalyptic number.

21395829087 is a deficient number, since it is larger than the sum of its proper divisors (10408384913).

21395829087 is a wasteful number, since it uses less digits than its factorization.

21395829087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129303 (or 129300 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 21395829087 in words is "twenty-one billion, three hundred ninety-five million, eight hundred twenty-nine thousand, eighty-seven".