21892797477 has 16 divisors (see below), whose sum is σ = 32731336000. Its totient is φ = 14461295472.

The previous prime is 21892797469. The next prime is 21892797491. The reversal of 21892797477 is 77479729812.

21892797477 is a `hidden beast` number, since 2 + 1 + 8 + 92 + 79 + 7 + 477 = 666.

It is not a de Polignac number, because 21892797477 - 2³ = 21892797469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21892797427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3716527 + ... + 3722412.

It is an arithmetic number, because the mean of its divisors is an integer number (2045708500).

Almost surely, 2^21892797477 is an apocalyptic number.

21892797477 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21892797477 is a deficient number, since it is larger than the sum of its proper divisors (10838538523).

21892797477 is a wasteful number, since it uses less digits than its factorization.

21892797477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7439057 (or 7439051 counting only the distinct ones).

The product of its digits is 24893568, while the sum is 63.

The spelling of 21892797477 in words is "twenty-one billion, eight hundred ninety-two million, seven hundred ninety-seven thousand, four hundred seventy-seven".