21702364066 has 16 divisors (see below), whose sum is σ = 32717544480. Its totient is φ = 10796546880.

The previous prime is 21702364009. The next prime is 21702364093. The reversal of 21702364066 is 66046320712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2108665 + ... + 2118931.

It is an arithmetic number, because the mean of its divisors is an integer number (2044846530).

Almost surely, 2^21702364066 is an apocalyptic number.

21702364066 is a deficient number, since it is larger than the sum of its proper divisors (11015180414).

21702364066 is a wasteful number, since it uses less digits than its factorization.

21702364066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15489.

The product of its (nonzero) digits is 72576, while the sum is 37.

Adding to 21702364066 its reverse (66046320712), we get a palindrome (87748684778).

The spelling of 21702364066 in words is "twenty-one billion, seven hundred two million, three hundred sixty-four thousand, sixty-six".