22121431 has 2 divisors, whose sum is σ = 22121432. Its totient is φ = 22121430.

The previous prime is 22121387. The next prime is 22121447. The reversal of 22121431 is 13412122.

It is an a-pointer prime, because the next prime (22121447) can be obtained adding 22121431 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22121431 - 2⁷ = 22121303 is a prime.

It is a super-2 number, since 2×22121431² = 978715418975522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060715 + 11060716.

It is an arithmetic number, because the mean of its divisors is an integer number (11060716).

Almost surely, 2^22121431 is an apocalyptic number.

22121431 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121431 is an equidigital number, since it uses as much as digits as its factorization.

22121431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 16.

The square root of 22121431 is about 4703.3425348363. The cubic root of 22121431 is about 280.7185244728.

Adding to 22121431 its reverse (13412122), we get a palindrome (35533553).

The spelling of 22121431 in words is "twenty-two million, one hundred twenty-one thousand, four hundred thirty-one".