221024431 has 2 divisors, whose sum is σ = 221024432. Its totient is φ = 221024430.

The previous prime is 221024413. The next prime is 221024449. The reversal of 221024431 is 134420122.

221024431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (221024413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (221024413) and next prime (221024449).

It is a cyclic number.

It is not a de Polignac number, because 221024431 - 2⁷ = 221024303 is a prime.

It is a super-2 number, since 2×221024431² = 97703598197747522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221024399 and 221024408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221024471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110512215 + 110512216.

It is an arithmetic number, because the mean of its divisors is an integer number (110512216).

Almost surely, 2^221024431 is an apocalyptic number.

221024431 is a deficient number, since it is larger than the sum of its proper divisors (1).

221024431 is an equidigital number, since it uses as much as digits as its factorization.

221024431 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 221024431 is about 14866.8904280619. The cubic root of 221024431 is about 604.6166375809.

Adding to 221024431 its reverse (134420122), we get a palindrome (355444553).

The spelling of 221024431 in words is "two hundred twenty-one million, twenty-four thousand, four hundred thirty-one".