21077429008 has 10 divisors (see below), whose sum is σ = 40837518734. Its totient is φ = 10538714496.

The previous prime is 21077428979. The next prime is 21077429029. The reversal of 21077429008 is 80092477012.

It can be written as a sum of positive squares in only one way, i.e., 14143869184 + 6933559824 = 118928^2 + 83268^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658669641 + ... + 658669672.

Almost surely, 2^21077429008 is an apocalyptic number.

It is an amenable number.

21077429008 is a deficient number, since it is larger than the sum of its proper divisors (19760089726).

21077429008 is a wasteful number, since it uses less digits than its factorization.

21077429008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317339321 (or 1317339315 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 21077429008 in words is "twenty-one billion, seventy-seven million, four hundred twenty-nine thousand, eight".