21789037117950 has 24 divisors (see below), whose sum is σ = 54036812052888. Its totient is φ = 5810409898080.

The previous prime is 21789037117933. The next prime is 21789037118041. The reversal of 21789037117950 is 5971173098712.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72630123577 + ... + 72630123876.

It is an arithmetic number, because the mean of its divisors is an integer number (2251533835537).

Almost surely, 2^{21789037117950} is an apocalyptic number.

21789037117950 is an abundant number, since it is smaller than the sum of its proper divisors (32247774934938).

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

21789037117950 is a wasteful number, since it uses less digits than its factorization.

21789037117950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145260247468 (or 145260247463 counting only the distinct ones).

The product of its (nonzero) digits is 6667920, while the sum is 60.

The spelling of 21789037117950 in words is "twenty-one trillion, seven hundred eighty-nine billion, thirty-seven million, one hundred seventeen thousand, nine hundred fifty".