221021013131 has 16 divisors (see below), whose sum is σ = 229227847680. Its totient is φ = 212883841440.

The previous prime is 221021013107. The next prime is 221021013211. The reversal of 221021013131 is 131310120122.

It is a cyclic number.

It is not a de Polignac number, because 221021013131 - 2⁶ = 221021013067 is a prime.

It is a super-2 number, since 2×221021013131² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221021013431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5771810 + ... + 5809976.

It is an arithmetic number, because the mean of its divisors is an integer number (14326740480).

Almost surely, 2^221021013131 is an apocalyptic number.

221021013131 is a deficient number, since it is larger than the sum of its proper divisors (8206834549).

221021013131 is a wasteful number, since it uses less digits than its factorization.

221021013131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39074.

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

Adding to 221021013131 its reverse (131310120122), we get a palindrome (352331133253).

The spelling of 221021013131 in words is "two hundred twenty-one billion, twenty-one million, thirteen thousand, one hundred thirty-one".