21956378286 has 8 divisors (see below), whose sum is σ = 43912756584. Its totient is φ = 7318792760.

The previous prime is 21956378233. The next prime is 21956378287. The reversal of 21956378286 is 68287365912.

It is a sphenic number, since it is the product of 3 distinct primes.

21956378286 is an admirable number.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1829698185 + ... + 1829698196.

It is an arithmetic number, because the mean of its divisors is an integer number (5489094573).

Almost surely, 2^21956378286 is an apocalyptic number.

21956378286 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21956378286 is a wasteful number, since it uses less digits than its factorization.

21956378286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3659396386.

The product of its digits is 8709120, while the sum is 57.

The spelling of 21956378286 in words is "twenty-one billion, nine hundred fifty-six million, three hundred seventy-eight thousand, two hundred eighty-six".