21374647136 has 12 divisors (see below), whose sum is σ = 42081336612. Its totient is φ = 10687323552.

The previous prime is 21374647123. The next prime is 21374647141. The reversal of 21374647136 is 63174647312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333978830 + ... + 333978893.

It is an arithmetic number, because the mean of its divisors is an integer number (3506778051).

Almost surely, 2^21374647136 is an apocalyptic number.

It is an amenable number.

21374647136 is a deficient number, since it is larger than the sum of its proper divisors (20706689476).

21374647136 is an equidigital number, since it uses as much as digits as its factorization.

21374647136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667957733 (or 667957725 counting only the distinct ones).

The product of its digits is 508032, while the sum is 44.

The spelling of 21374647136 in words is "twenty-one billion, three hundred seventy-four million, six hundred forty-seven thousand, one hundred thirty-six".