21677257942 has 16 divisors (see below), whose sum is σ = 32976088992. Its totient is φ = 10686078720.

The previous prime is 21677257919. The next prime is 21677257961. The reversal of 21677257942 is 24975277612.

It is a self number, because there is not a number n which added to its sum of digits gives 21677257942.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161409 + ... + 263452.

It is an arithmetic number, because the mean of its divisors is an integer number (2061005562).

Almost surely, 2^21677257942 is an apocalyptic number.

21677257942 is a deficient number, since it is larger than the sum of its proper divisors (11298831050).

21677257942 is a wasteful number, since it uses less digits than its factorization.

21677257942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425223.

The product of its digits is 2963520, while the sum is 52.

The spelling of 21677257942 in words is "twenty-one billion, six hundred seventy-seven million, two hundred fifty-seven thousand, nine hundred forty-two".