21022405205231 has 2 divisors, whose sum is σ = 21022405205232. Its totient is φ = 21022405205230.

The previous prime is 21022405205213. The next prime is 21022405205257. The reversal of 21022405205231 is 13250250422012.

It is a happy number.

Together with previous prime (21022405205213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21022405205231 - 2¹⁸ = 21022404943087 is a prime.

It is a super-2 number, since 2×21022405205231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21022405205194 and 21022405205203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022405204231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511202602615 + 10511202602616.

It is an arithmetic number, because the mean of its divisors is an integer number (10511202602616).

Almost surely, 2^{21022405205231} is an apocalyptic number.

21022405205231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022405205231 is an equidigital number, since it uses as much as digits as its factorization.

21022405205231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 21022405205231 its reverse (13250250422012), we get a palindrome (34272655627243).

The spelling of 21022405205231 in words is "twenty-one trillion, twenty-two billion, four hundred five million, two hundred five thousand, two hundred thirty-one".