21065623157322 has 128 divisors (see below), whose sum is σ = 49897481587200. Its totient is φ = 6572899187712.

The previous prime is 21065623157303. The next prime is 21065623157357. The reversal of 21065623157322 is 22375132656012.

21065623157322 is a `hidden beast` number, since 2 + 1 + 0 + 6 + 5 + 6 + 2 + 315 + 7 + 322 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25194978 + ... + 26017650.

It is an arithmetic number, because the mean of its divisors is an integer number (389824074900).

Almost surely, 2^{21065623157322} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21065623157322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24948740793600).

21065623157322 is an abundant number, since it is smaller than the sum of its proper divisors (28831858429878).

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

21065623157322 is a wasteful number, since it uses less digits than its factorization.

21065623157322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823149 (or 823143 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 21065623157322 in words is "twenty-one trillion, sixty-five billion, six hundred twenty-three million, one hundred fifty-seven thousand, three hundred twenty-two".