21534125465 has 8 divisors (see below), whose sum is σ = 25860729600. Its totient is φ = 17214114352.

The previous prime is 21534125441. The next prime is 21534125477. The reversal of 21534125465 is 56452143512.

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 21534125465 - 2²⁰ = 21533076889 is a prime.

It is a super-2 number, since 2×21534125465² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1641065 + ... + 1654134.

It is an arithmetic number, because the mean of its divisors is an integer number (3232591200).

Almost surely, 2^21534125465 is an apocalyptic number.

It is an amenable number.

21534125465 is a deficient number, since it is larger than the sum of its proper divisors (4326604135).

21534125465 is a wasteful number, since it uses less digits than its factorization.

21534125465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3296511.

The product of its digits is 144000, while the sum is 38.

Adding to 21534125465 its reverse (56452143512), we get a palindrome (77986268977).

The spelling of 21534125465 in words is "twenty-one billion, five hundred thirty-four million, one hundred twenty-five thousand, four hundred sixty-five".