22421431 has 2 divisors, whose sum is σ = 22421432. Its totient is φ = 22421430.

The previous prime is 22421429. The next prime is 22421449. The reversal of 22421431 is 13412422.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22421431 - 2¹ = 22421429 is a prime.

It is a super-2 number, since 2×22421431² = 1005441136175522, which contains 22 as substring.

Together with 22421429, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22421399 and 22421408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22421411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11210715 + 11210716.

It is an arithmetic number, because the mean of its divisors is an integer number (11210716).

Almost surely, 2^22421431 is an apocalyptic number.

22421431 is a deficient number, since it is larger than the sum of its proper divisors (1).

22421431 is an equidigital number, since it uses as much as digits as its factorization.

22421431 is an evil number, because the sum of its binary digits is even.

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

The square root of 22421431 is about 4735.1273478123. The cubic root of 22421431 is about 281.9818198296.

Adding to 22421431 its reverse (13412422), we get a palindrome (35833853).

Subtracting from 22421431 its reverse (13412422), we obtain a palindrome (9009009).

The spelling of 22421431 in words is "twenty-two million, four hundred twenty-one thousand, four hundred thirty-one".