21224441220431 has 2 divisors, whose sum is σ = 21224441220432. Its totient is φ = 21224441220430.

The previous prime is 21224441220421. The next prime is 21224441220457. The reversal of 21224441220431 is 13402214442212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21224441220431 - 2³⁴ = 21207261351247 is a prime.

It is a super-2 number, since 2×21224441220431² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21224441220421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612220610215 + 10612220610216.

It is an arithmetic number, because the mean of its divisors is an integer number (10612220610216).

Almost surely, 2^{21224441220431} is an apocalyptic number.

21224441220431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224441220431 is an equidigital number, since it uses as much as digits as its factorization.

21224441220431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 32.

Adding to 21224441220431 its reverse (13402214442212), we get a palindrome (34626655662643).

The spelling of 21224441220431 in words is "twenty-one trillion, two hundred twenty-four billion, four hundred forty-one million, two hundred twenty thousand, four hundred thirty-one".