21786956982 has 24 divisors (see below), whose sum is σ = 53948655696. Its totient is φ = 6224844816.

The previous prime is 21786956959. The next prime is 21786956987. The reversal of 21786956982 is 28965968712.

21786956982 is a `hidden beast` number, since 2 + 1 + 7 + 8 + 69 + 569 + 8 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21786956987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86456053 + ... + 86456304.

It is an arithmetic number, because the mean of its divisors is an integer number (2247860654).

Almost surely, 2^21786956982 is an apocalyptic number.

21786956982 is an abundant number, since it is smaller than the sum of its proper divisors (32161698714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21786956982 is a wasteful number, since it uses less digits than its factorization.

21786956982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172912372 (or 172912369 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The spelling of 21786956982 in words is "twenty-one billion, seven hundred eighty-six million, nine hundred fifty-six thousand, nine hundred eighty-two".