21652513531 has 8 divisors (see below), whose sum is σ = 23905514304. Its totient is φ = 19446944520.

The previous prime is 21652513511. The next prime is 21652513583. The reversal of 21652513531 is 13531525612.

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 21652513531 - 2²⁹ = 21115642619 is a prime.

It is a super-2 number, since 2×21652513531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21652513501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11856981 + ... + 11858806.

It is an arithmetic number, because the mean of its divisors is an integer number (2988189288).

Almost surely, 2^21652513531 is an apocalyptic number.

21652513531 is a deficient number, since it is larger than the sum of its proper divisors (2253000773).

21652513531 is a wasteful number, since it uses less digits than its factorization.

21652513531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23715881.

The product of its digits is 27000, while the sum is 34.

The spelling of 21652513531 in words is "twenty-one billion, six hundred fifty-two million, five hundred thirteen thousand, five hundred thirty-one".