21525086619 has 12 divisors (see below), whose sum is σ = 31466392776. Its totient is φ = 14177164992.

The previous prime is 21525086599. The next prime is 21525086621. The reversal of 21525086619 is 91668052512.

21525086619 is a `hidden beast` number, since 2 + 1 + 5 + 25 + 0 + 8 + 6 + 619 = 666.

It is not a de Polignac number, because 21525086619 - 2¹¹ = 21525084571 is a prime.

It is a super-2 number, since 2×21525086619² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21525082619) 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, 14406942 + ... + 14408435.

It is an arithmetic number, because the mean of its divisors is an integer number (2622199398).

Almost surely, 2^21525086619 is an apocalyptic number.

21525086619 is a deficient number, since it is larger than the sum of its proper divisors (9941306157).

21525086619 is a wasteful number, since it uses less digits than its factorization.

21525086619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28815466 (or 28815463 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The spelling of 21525086619 in words is "twenty-one billion, five hundred twenty-five million, eighty-six thousand, six hundred nineteen".