21222154224431 has 2 divisors, whose sum is σ = 21222154224432. Its totient is φ = 21222154224430.

The previous prime is 21222154224377. The next prime is 21222154224461. The reversal of 21222154224431 is 13442245122212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21222154224431 - 2¹⁰ = 21222154223407 is a prime.

It is a super-2 number, since 2×21222154224431² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222154224391 and 21222154224400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222154224461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611077112215 + 10611077112216.

It is an arithmetic number, because the mean of its divisors is an integer number (10611077112216).

Almost surely, 2^{21222154224431} is an apocalyptic number.

21222154224431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222154224431 is an equidigital number, since it uses as much as digits as its factorization.

21222154224431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61440, while the sum is 35.

Adding to 21222154224431 its reverse (13442245122212), we get a palindrome (34664399346643).

The spelling of 21222154224431 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred fifty-four million, two hundred twenty-four thousand, four hundred thirty-one".