21532053613 has 16 divisors (see below), whose sum is σ = 26077075200. Its totient is φ = 17356075776.

The previous prime is 21532053581. The next prime is 21532053629. The reversal of 21532053613 is 31635023512.

It is a cyclic number.

It is not a de Polignac number, because 21532053613 - 2⁵ = 21532053581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532053713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71563 + ... + 219511.

It is an arithmetic number, because the mean of its divisors is an integer number (1629817200).

Almost surely, 2^21532053613 is an apocalyptic number.

It is an amenable number.

21532053613 is a deficient number, since it is larger than the sum of its proper divisors (4545021587).

21532053613 is a wasteful number, since it uses less digits than its factorization.

21532053613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149196.

The product of its (nonzero) digits is 16200, while the sum is 31.

The spelling of 21532053613 in words is "twenty-one billion, five hundred thirty-two million, fifty-three thousand, six hundred thirteen".