21001500653 has 8 divisors (see below), whose sum is σ = 24775964160. Its totient is φ = 17420599440.

The previous prime is 21001500631. The next prime is 21001500661. The reversal of 21001500653 is 35600510012.

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 21001500653 - 2⁶ = 21001500589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001500673) 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, 48390338 + ... + 48390771.

It is an arithmetic number, because the mean of its divisors is an integer number (3096995520).

Almost surely, 2^21001500653 is an apocalyptic number.

It is an amenable number.

21001500653 is a deficient number, since it is larger than the sum of its proper divisors (3774463507).

21001500653 is an equidigital number, since it uses as much as digits as its factorization.

21001500653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96781147.

The product of its (nonzero) digits is 900, while the sum is 23.

The spelling of 21001500653 in words is "twenty-one billion, one million, five hundred thousand, six hundred fifty-three".