21601630674361 has 4 divisors (see below), whose sum is σ = 21601679053392. Its totient is φ = 21601582295332.

The previous prime is 21601630674307. The next prime is 21601630674391. The reversal of 21601630674361 is 16347603610612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21601630674361 - 2²⁹ = 21601093803449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21601630674391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23513455 + ... + 24414868.

It is an arithmetic number, because the mean of its divisors is an integer number (5400419763348).

Almost surely, 2^{21601630674361} is an apocalyptic number.

It is an amenable number.

21601630674361 is a deficient number, since it is larger than the sum of its proper divisors (48379031).

21601630674361 is an equidigital number, since it uses as much as digits as its factorization.

21601630674361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48379030.

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 21601630674361 in words is "twenty-one trillion, six hundred one billion, six hundred thirty million, six hundred seventy-four thousand, three hundred sixty-one".