21652135325205 has 64 divisors (see below), whose sum is σ = 43923856435200. Its totient is φ = 8845776587520.

The previous prime is 21652135325203. The next prime is 21652135325237. The reversal of 21652135325205 is 50252353125612.

It is not a de Polignac number, because 21652135325205 - 2¹ = 21652135325203 is a prime.

It is a super-2 number, since 2×21652135325205² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21652135325203) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 158799970 + ... + 158936259.

It is an arithmetic number, because the mean of its divisors is an integer number (686310256800).

Almost surely, 2^{21652135325205} is an apocalyptic number.

It is an amenable number.

21652135325205 is an abundant number, since it is smaller than the sum of its proper divisors (22271721109995).

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

21652135325205 is a wasteful number, since it uses less digits than its factorization.

21652135325205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317736314.

The product of its (nonzero) digits is 540000, while the sum is 42.

The spelling of 21652135325205 in words is "twenty-one trillion, six hundred fifty-two billion, one hundred thirty-five million, three hundred twenty-five thousand, two hundred five".