21782722086 has 24 divisors (see below), whose sum is σ = 47205661464. Its totient is φ = 7259405280.

The previous prime is 21782721977. The next prime is 21782722133. The reversal of 21782722086 is 68022728712.

21782722086 is a `hidden beast` number, since 2 + 178 + 272 + 208 + 6 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 33951 + ... + 211466.

It is an arithmetic number, because the mean of its divisors is an integer number (1966902561).

Almost surely, 2^21782722086 is an apocalyptic number.

21782722086 is an abundant number, since it is smaller than the sum of its proper divisors (25422939378).

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

21782722086 is a wasteful number, since it uses less digits than its factorization.

21782722086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250356 (or 250353 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 21782722086 in words is "twenty-one billion, seven hundred eighty-two million, seven hundred twenty-two thousand, eighty-six".