21457677772 has 24 divisors (see below), whose sum is σ = 37627526384. Its totient is φ = 10706980032.

The previous prime is 21457677757. The next prime is 21457677779. The reversal of 21457677772 is 27777675412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21457677779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7670278 + ... + 7673074.

Almost surely, 2^21457677772 is an apocalyptic number.

It is an amenable number.

21457677772 is a deficient number, since it is larger than the sum of its proper divisors (16169848612).

21457677772 is a wasteful number, since it uses less digits than its factorization.

21457677772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6025 (or 6023 counting only the distinct ones).

The product of its digits is 8067360, while the sum is 55.

The spelling of 21457677772 in words is "twenty-one billion, four hundred fifty-seven million, six hundred seventy-seven thousand, seven hundred seventy-two".