221153431 has 2 divisors, whose sum is σ = 221153432. Its totient is φ = 221153430.

The previous prime is 221153423. The next prime is 221153437. The reversal of 221153431 is 134351122.

It is a happy number.

221153431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221153431 - 2³ = 221153423 is a prime.

It is a super-2 number, since 2×221153431² = 97817680086143522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221153437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110576715 + 110576716.

It is an arithmetic number, because the mean of its divisors is an integer number (110576716).

Almost surely, 2^221153431 is an apocalyptic number.

221153431 is a deficient number, since it is larger than the sum of its proper divisors (1).

221153431 is an equidigital number, since it uses as much as digits as its factorization.

221153431 is an evil number, because the sum of its binary digits is even.

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

The square root of 221153431 is about 14871.2282949325. The cubic root of 221153431 is about 604.7342420420.

The spelling of 221153431 in words is "two hundred twenty-one million, one hundred fifty-three thousand, four hundred thirty-one".