2021566465 has 16 divisors (see below), whose sum is σ = 2559427200. Its totient is φ = 1528612992.

The previous prime is 2021566453. The next prime is 2021566487. The reversal of 2021566465 is 5646651202.

It is a cyclic number.

It is not a de Polignac number, because 2021566465 - 2²³ = 2013177857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17469 + ... + 65941.

It is an arithmetic number, because the mean of its divisors is an integer number (159964200).

Almost surely, 2^2021566465 is an apocalyptic number.

It is an amenable number.

2021566465 is a deficient number, since it is larger than the sum of its proper divisors (537860735).

2021566465 is a wasteful number, since it uses less digits than its factorization.

2021566465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48936.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 2021566465 is about 44961.8334256956. The cubic root of 2021566465 is about 1264.4335426717.

The spelling of 2021566465 in words is "two billion, twenty-one million, five hundred sixty-six thousand, four hundred sixty-five".