21877864436 has 12 divisors (see below), whose sum is σ = 38290338240. Its totient is φ = 10937767800.

The previous prime is 21877864403. The next prime is 21877864457. The reversal of 21877864436 is 63446877812.

It is a hoax number, since the sum of its digits (56) 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 3 ways as a sum of consecutive naturals, for example, 248126 + ... + 324533.

It is an arithmetic number, because the mean of its divisors is an integer number (3190861520).

Almost surely, 2^21877864436 is an apocalyptic number.

It is an amenable number.

21877864436 is a deficient number, since it is larger than the sum of its proper divisors (16412473804).

21877864436 is a wasteful number, since it uses less digits than its factorization.

21877864436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582214 (or 582212 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 56.

The spelling of 21877864436 in words is "twenty-one billion, eight hundred seventy-seven million, eight hundred sixty-four thousand, four hundred thirty-six".