21365960651 has 8 divisors (see below), whose sum is σ = 24419561184. Its totient is φ = 18312690240.

The previous prime is 21365960573. The next prime is 21365960663. The reversal of 21365960651 is 15606956312.

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 21365960651 - 2¹⁰ = 21365959627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21365960851) 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, 76631 + ... + 220463.

It is an arithmetic number, because the mean of its divisors is an integer number (3052445148).

Almost surely, 2^21365960651 is an apocalyptic number.

21365960651 is a deficient number, since it is larger than the sum of its proper divisors (3053600533).

21365960651 is a wasteful number, since it uses less digits than its factorization.

21365960651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165061.

The product of its (nonzero) digits is 291600, while the sum is 44.

The spelling of 21365960651 in words is "twenty-one billion, three hundred sixty-five million, nine hundred sixty thousand, six hundred fifty-one".