21655250236326 has 24 divisors (see below), whose sum is σ = 50381602591320. Its totient is φ = 6187214353152.

The previous prime is 21655250236313. The next prime is 21655250236327. The reversal of 21655250236326 is 62363205255612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655250236327) 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, 36828656571 + ... + 36828657158.

It is an arithmetic number, because the mean of its divisors is an integer number (2099233441305).

Almost surely, 2^{21655250236326} is an apocalyptic number.

21655250236326 is an abundant number, since it is smaller than the sum of its proper divisors (28726352354994).

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

21655250236326 is a wasteful number, since it uses less digits than its factorization.

21655250236326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73657313748 (or 73657313741 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 48.

The spelling of 21655250236326 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred fifty million, two hundred thirty-six thousand, three hundred twenty-six".