221032131 has 4 divisors (see below), whose sum is σ = 294709512. Its totient is φ = 147354752.

The previous prime is 221032127. The next prime is 221032151. The reversal of 221032131 is 131230122.

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 221032131 - 2² = 221032127 is a prime.

It is a super-2 number, since 2×221032131² = 97710405868802322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221032131.

It is not an unprimeable number, because it can be changed into a prime (221032121) 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, 36838686 + ... + 36838691.

It is an arithmetic number, because the mean of its divisors is an integer number (73677378).

Almost surely, 2^221032131 is an apocalyptic number.

221032131 is a deficient number, since it is larger than the sum of its proper divisors (73677381).

221032131 is an equidigital number, since it uses as much as digits as its factorization.

221032131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73677380.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221032131 is about 14867.1493905187. The cubic root of 221032131 is about 604.6236586661.

Adding to 221032131 its reverse (131230122), we get a palindrome (352262253).

The spelling of 221032131 in words is "two hundred twenty-one million, thirty-two thousand, one hundred thirty-one".