221325131 has 2 divisors, whose sum is σ = 221325132. Its totient is φ = 221325130.

The previous prime is 221325119. The next prime is 221325179. The reversal of 221325131 is 131523122.

221325131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221325131 - 2¹⁸ = 221062987 is a prime.

It is a super-2 number, since 2×221325131² = 97969627224334322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221325631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110662565 + 110662566.

It is an arithmetic number, because the mean of its divisors is an integer number (110662566).

Almost surely, 2^221325131 is an apocalyptic number.

221325131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221325131 is an equidigital number, since it uses as much as digits as its factorization.

221325131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 20.

The square root of 221325131 is about 14877.0000672179. Note that the first 4 decimals coincide. The cubic root of 221325131 is about 604.8907035675.

Adding to 221325131 its reverse (131523122), we get a palindrome (352848253).

The spelling of 221325131 in words is "two hundred twenty-one million, three hundred twenty-five thousand, one hundred thirty-one".