240221431 has 2 divisors, whose sum is σ = 240221432. Its totient is φ = 240221430.

The previous prime is 240221411. The next prime is 240221447. The reversal of 240221431 is 134122042.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240221431 is a prime.

It is a super-2 number, since 2×240221431² = 115412671823375522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 240221399 and 240221408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240221411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120110715 + 120110716.

It is an arithmetic number, because the mean of its divisors is an integer number (120110716).

Almost surely, 2^240221431 is an apocalyptic number.

240221431 is a deficient number, since it is larger than the sum of its proper divisors (1).

240221431 is an equidigital number, since it uses as much as digits as its factorization.

240221431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 240221431 is about 15499.0783919561. The cubic root of 240221431 is about 621.6375639986.

Adding to 240221431 its reverse (134122042), we get a palindrome (374343473).

The spelling of 240221431 in words is "two hundred forty million, two hundred twenty-one thousand, four hundred thirty-one".