221435131 has 2 divisors, whose sum is σ = 221435132. Its totient is φ = 221435130.

The previous prime is 221435089. The next prime is 221435141. The reversal of 221435131 is 131534122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221435131 - 2⁷ = 221435003 is a prime.

It is a super-2 number, since 2×221435131² = 98067034481974322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221435141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110717565 + 110717566.

It is an arithmetic number, because the mean of its divisors is an integer number (110717566).

Almost surely, 2^221435131 is an apocalyptic number.

221435131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221435131 is an equidigital number, since it uses as much as digits as its factorization.

221435131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 221435131 is about 14880.6965898778. The cubic root of 221435131 is about 604.9908984811.

Adding to 221435131 its reverse (131534122), we get a palindrome (352969253).

The spelling of 221435131 in words is "two hundred twenty-one million, four hundred thirty-five thousand, one hundred thirty-one".