221311200131 has 4 divisors (see below), whose sum is σ = 252927085872. Its totient is φ = 189695314392.

The previous prime is 221311200127. The next prime is 221311200167. The reversal of 221311200131 is 131002113122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221311200131 - 2² = 221311200127 is a prime.

It is a super-2 number, since 2×221311200131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221311209131) 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, 15807942860 + ... + 15807942873.

It is an arithmetic number, because the mean of its divisors is an integer number (63231771468).

Almost surely, 2^221311200131 is an apocalyptic number.

221311200131 is a deficient number, since it is larger than the sum of its proper divisors (31615885741).

221311200131 is an equidigital number, since it uses as much as digits as its factorization.

221311200131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31615885740.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 221311200131 its reverse (131002113122), we get a palindrome (352313313253).

The spelling of 221311200131 in words is "two hundred twenty-one billion, three hundred eleven million, two hundred thousand, one hundred thirty-one".