21115310650356 has 48 divisors (see below), whose sum is σ = 53209294617024. Its totient is φ = 6478613492736.

The previous prime is 21115310650351. The next prime is 21115310650381. The reversal of 21115310650356 is 65305601351112.

It is a super-2 number, since 2×21115310650356² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115310650351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191665266 + ... + 191775401.

It is an arithmetic number, because the mean of its divisors is an integer number (1108526971188).

Almost surely, 2^{21115310650356} is an apocalyptic number.

21115310650356 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21115310650356 is an abundant number, since it is smaller than the sum of its proper divisors (32093983966668).

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

21115310650356 is a wasteful number, since it uses less digits than its factorization.

21115310650356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383441040 (or 383441038 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 39.

The spelling of 21115310650356 in words is "twenty-one trillion, one hundred fifteen billion, three hundred ten million, six hundred fifty thousand, three hundred fifty-six".