30221431 has 2 divisors, whose sum is σ = 30221432. Its totient is φ = 30221430.

The previous prime is 30221369. The next prime is 30221441. The reversal of 30221431 is 13412203.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30221431 - 2¹¹ = 30219383 is a prime.

It is a super-2 number, since 2×30221431² = 1826669783375522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30221441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15110715 + 15110716.

It is an arithmetic number, because the mean of its divisors is an integer number (15110716).

Almost surely, 2^30221431 is an apocalyptic number.

30221431 is a deficient number, since it is larger than the sum of its proper divisors (1).

30221431 is an equidigital number, since it uses as much as digits as its factorization.

30221431 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 16.

The square root of 30221431 is about 5497.4022046781. The cubic root of 30221431 is about 311.4858635943.

Adding to 30221431 its reverse (13412203), we get a palindrome (43633634).

The spelling of 30221431 in words is "thirty million, two hundred twenty-one thousand, four hundred thirty-one".