21772794051 has 24 divisors (see below), whose sum is σ = 33233712720. Its totient is φ = 13697703936.

The previous prime is 21772794049. The next prime is 21772794061. The reversal of 21772794051 is 15049727712.

21772794051 is a `hidden beast` number, since 2 + 177 + 2 + 79 + 405 + 1 = 666.

It is not a de Polignac number, because 21772794051 - 2¹ = 21772794049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21772793988 and 21772794006.

It is not an unprimeable number, because it can be changed into a prime (21772794031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 203770 + ... + 291663.

It is an arithmetic number, because the mean of its divisors is an integer number (1384738030).

Almost surely, 2^21772794051 is an apocalyptic number.

21772794051 is a deficient number, since it is larger than the sum of its proper divisors (11460918669).

21772794051 is a wasteful number, since it uses less digits than its factorization.

21772794051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495715 (or 495712 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The spelling of 21772794051 in words is "twenty-one billion, seven hundred seventy-two million, seven hundred ninety-four thousand, fifty-one".