21956378288 has 40 divisors (see below), whose sum is σ = 48507707808. Its totient is φ = 9537610752.

The previous prime is 21956378287. The next prime is 21956378293. The reversal of 21956378288 is 88287365912.

It is not an unprimeable number, because it can be changed into a prime (21956378287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3101156 + ... + 3108227.

Almost surely, 2^21956378288 is an apocalyptic number.

It is an amenable number.

21956378288 is an abundant number, since it is smaller than the sum of its proper divisors (26551329520).

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

21956378288 is a wasteful number, since it uses less digits than its factorization.

21956378288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6209421 (or 6209415 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 59.

The spelling of 21956378288 in words is "twenty-one billion, nine hundred fifty-six million, three hundred seventy-eight thousand, two hundred eighty-eight".