2021660536604 has 6 divisors (see below), whose sum is σ = 3537905939064. Its totient is φ = 1010830268300.

The previous prime is 2021660536601. The next prime is 2021660536633. The reversal of 2021660536604 is 4066350661202.

It is a happy number.

It is a super-2 number, since 2×2021660536604² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021660536601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252707567072 + ... + 252707567079.

It is an arithmetic number, because the mean of its divisors is an integer number (589650989844).

Almost surely, 2^{2021660536604} is an apocalyptic number.

It is an amenable number.

2021660536604 is a deficient number, since it is larger than the sum of its proper divisors (1516245402460).

2021660536604 is a wasteful number, since it uses less digits than its factorization.

2021660536604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505415134155 (or 505415134153 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 2021660536604 in words is "two trillion, twenty-one billion, six hundred sixty million, five hundred thirty-six thousand, six hundred four".