21877760047 has 32 divisors (see below), whose sum is σ = 25910176320. Its totient is φ = 18211307520.

The previous prime is 21877759979. The next prime is 21877760053. The reversal of 21877760047 is 74006777812.

It is a cyclic number.

It is not a de Polignac number, because 21877760047 - 2²³ = 21869371439 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 (21877860047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9884913 + ... + 9887125.

It is an arithmetic number, because the mean of its divisors is an integer number (809693010).

Almost surely, 2^21877760047 is an apocalyptic number.

21877760047 is a deficient number, since it is larger than the sum of its proper divisors (4032416273).

21877760047 is a wasteful number, since it uses less digits than its factorization.

21877760047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763.

The product of its (nonzero) digits is 921984, while the sum is 49.

The spelling of 21877760047 in words is "twenty-one billion, eight hundred seventy-seven million, seven hundred sixty thousand, forty-seven".