21275637772 has 6 divisors (see below), whose sum is σ = 37232366108. Its totient is φ = 10637818884.

The previous prime is 21275637709. The next prime is 21275637787. The reversal of 21275637772 is 27773657212.

It is an unprimeable number.

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, 2659454718 + ... + 2659454725.

Almost surely, 2^21275637772 is an apocalyptic number.

It is an amenable number.

21275637772 is a deficient number, since it is larger than the sum of its proper divisors (15956728336).

21275637772 is a wasteful number, since it uses less digits than its factorization.

21275637772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5318909447 (or 5318909445 counting only the distinct ones).

The product of its digits is 1728720, while the sum is 49.

The spelling of 21275637772 in words is "twenty-one billion, two hundred seventy-five million, six hundred thirty-seven thousand, seven hundred seventy-two".