221000310131 has 4 divisors (see below), whose sum is σ = 234000328392. Its totient is φ = 208000291872.

The previous prime is 221000310127. The next prime is 221000310203. The reversal of 221000310131 is 131013000122.

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 221000310131 - 2² = 221000310127 is a prime.

It is a super-2 number, since 2×221000310131² (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 (221000310101) 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, 6500009105 + ... + 6500009138.

It is an arithmetic number, because the mean of its divisors is an integer number (58500082098).

Almost surely, 2^221000310131 is an apocalyptic number.

221000310131 is a deficient number, since it is larger than the sum of its proper divisors (13000018261).

221000310131 is a wasteful number, since it uses less digits than its factorization.

221000310131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13000018260.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 221000310131 its reverse (131013000122), we get a palindrome (352013310253).

The spelling of 221000310131 in words is "two hundred twenty-one billion, three hundred ten thousand, one hundred thirty-one".