221230131 has 8 divisors (see below), whose sum is σ = 298014864. Its totient is φ = 145966080.

The previous prime is 221230127. The next prime is 221230159. The reversal of 221230131 is 131032122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221230131 - 2² = 221230127 is a prime.

It is a super-2 number, since 2×221230131² = 97885541724554322, 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 221230131.

It is not an unprimeable number, because it can be changed into a prime (221230631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379830 + ... + 380411.

It is an arithmetic number, because the mean of its divisors is an integer number (37251858).

Almost surely, 2^221230131 is an apocalyptic number.

221230131 is a deficient number, since it is larger than the sum of its proper divisors (76784733).

221230131 is an equidigital number, since it uses as much as digits as its factorization.

221230131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760341.

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

The square root of 221230131 is about 14873.8068765195. The cubic root of 221230131 is about 604.8041448767.

Adding to 221230131 its reverse (131032122), we get a palindrome (352262253).

The spelling of 221230131 in words is "two hundred twenty-one million, two hundred thirty thousand, one hundred thirty-one".