21958926264 has 48 divisors (see below), whose sum is σ = 64878648120.
Its totient is φ = 6654219840.
The previous prime is 21958926263. The next prime is 21958926289. The reversal of 21958926264 is 46262985912.
21958926264 is a `hidden beast` number, since 2 + 1 + 9 + 5 + 8 + 9 + 2 + 626 + 4 = 666.
It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.
It is a self number, because there is not a number n which added to its sum of digits gives 21958926264.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21958926263) 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, 13862167 + ... + 13863750.
Almost surely, 221958926264 is an apocalyptic number.
21958926264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.
It is an amenable number.
21958926264 is an abundant number, since it is smaller than the sum of its proper divisors (42919721856).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21958926264 is a wasteful number, since it uses less digits than its factorization.
21958926264 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 27725940 (or 27725933 counting only the distinct ones).
The product of its digits is 3732480, while the sum is 54.
The spelling of 21958926264 in words is "twenty-one billion, nine hundred fifty-eight million, nine hundred twenty-six thousand, two hundred sixty-four".