221340131 has 2 divisors, whose sum is σ = 221340132. Its totient is φ = 221340130.

The previous prime is 221340127. The next prime is 221340143. The reversal of 221340131 is 131043122.

221340131 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 221340131 - 2² = 221340127 is a prime.

It is a super-2 number, since 2×221340131² = 97982907182194322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221340191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110670065 + 110670066.

It is an arithmetic number, because the mean of its divisors is an integer number (110670066).

Almost surely, 2^221340131 is an apocalyptic number.

221340131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221340131 is an equidigital number, since it uses as much as digits as its factorization.

221340131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 221340131 is about 14877.5041925721. The cubic root of 221340131 is about 604.9043684648.

Adding to 221340131 its reverse (131043122), we get a palindrome (352383253).

The spelling of 221340131 in words is "two hundred twenty-one million, three hundred forty thousand, one hundred thirty-one".