21355342170250 has 64 divisors (see below), whose sum is σ = 46176873455232. Its totient is φ = 7308780192000.

The previous prime is 21355342170229. The next prime is 21355342170293. The reversal of 21355342170250 is 5207124355312.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 228352632 + ... + 228446131.

It is an arithmetic number, because the mean of its divisors is an integer number (721513647738).

Almost surely, 2^{21355342170250} is an apocalyptic number.

21355342170250 is an abundant number, since it is smaller than the sum of its proper divisors (24821531284982).

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

21355342170250 is a wasteful number, since it uses less digits than its factorization.

21355342170250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456798808 (or 456798798 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 40.

The spelling of 21355342170250 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred forty-two million, one hundred seventy thousand, two hundred fifty".