21222109124831 has 2 divisors, whose sum is σ = 21222109124832. Its totient is φ = 21222109124830.

The previous prime is 21222109124779. The next prime is 21222109124851. The reversal of 21222109124831 is 13842190122212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21222109124831 - 2¹⁰ = 21222109123807 is a prime.

It is a super-2 number, since 2×21222109124831² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222109124851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611054562415 + 10611054562416.

It is an arithmetic number, because the mean of its divisors is an integer number (10611054562416).

Almost surely, 2^{21222109124831} is an apocalyptic number.

21222109124831 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222109124831 is an equidigital number, since it uses as much as digits as its factorization.

21222109124831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 21222109124831 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred nine million, one hundred twenty-four thousand, eight hundred thirty-one".