21795388772 has 12 divisors (see below), whose sum is σ = 38953461120. Its totient is φ = 10665828456.

The previous prime is 21795388759. The next prime is 21795388787. The reversal of 21795388772 is 27788359712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57966272 + ... + 57966647.

It is an arithmetic number, because the mean of its divisors is an integer number (3246121760).

Almost surely, 2^21795388772 is an apocalyptic number.

It is an amenable number.

21795388772 is a deficient number, since it is larger than the sum of its proper divisors (17158072348).

21795388772 is a wasteful number, since it uses less digits than its factorization.

21795388772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115932970 (or 115932968 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 59.

The spelling of 21795388772 in words is "twenty-one billion, seven hundred ninety-five million, three hundred eighty-eight thousand, seven hundred seventy-two".