21523264653 has 8 divisors (see below), whose sum is σ = 31306566816. Its totient is φ = 13044402800.

The previous prime is 21523264627. The next prime is 21523264661. The reversal of 21523264653 is 35646232512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21523264653 - 2⁶ = 21523264589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523264663) 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, 326110038 + ... + 326110103.

It is an arithmetic number, because the mean of its divisors is an integer number (3913320852).

Almost surely, 2^21523264653 is an apocalyptic number.

It is an amenable number.

21523264653 is a deficient number, since it is larger than the sum of its proper divisors (9783302163).

21523264653 is a wasteful number, since it uses less digits than its factorization.

21523264653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652220155.

The product of its digits is 259200, while the sum is 39.

The spelling of 21523264653 in words is "twenty-one billion, five hundred twenty-three million, two hundred sixty-four thousand, six hundred fifty-three".