21077166532 has 6 divisors (see below), whose sum is σ = 36885041438. Its totient is φ = 10538583264.

The previous prime is 21077166529. The next prime is 21077166533. The reversal of 21077166532 is 23566177012.

It can be written as a sum of positive squares in only one way, i.e., 13100175936 + 7976990596 = 114456^2 + 89314^2 .

It is not an unprimeable number, because it can be changed into a prime (21077166533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2634645813 + ... + 2634645820.

Almost surely, 2^21077166532 is an apocalyptic number.

It is an amenable number.

21077166532 is a deficient number, since it is larger than the sum of its proper divisors (15807874906).

21077166532 is a wasteful number, since it uses less digits than its factorization.

21077166532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5269291637 (or 5269291635 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 21077166532 in words is "twenty-one billion, seventy-seven million, one hundred sixty-six thousand, five hundred thirty-two".