221046131 has 2 divisors, whose sum is σ = 221046132. Its totient is φ = 221046130.

The previous prime is 221046113. The next prime is 221046139. The reversal of 221046131 is 131640122.

Together with previous prime (221046113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221046131 - 2¹⁸ = 220783987 is a prime.

It is a super-2 number, since 2×221046131² = 97722784060138322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (221046139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110523065 + 110523066.

It is an arithmetic number, because the mean of its divisors is an integer number (110523066).

Almost surely, 2^221046131 is an apocalyptic number.

221046131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221046131 is an equidigital number, since it uses as much as digits as its factorization.

221046131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 221046131 is about 14867.6202197931. The cubic root of 221046131 is about 604.6364238577.

Adding to 221046131 its reverse (131640122), we get a palindrome (352686253).

The spelling of 221046131 in words is "two hundred twenty-one million, forty-six thousand, one hundred thirty-one".