21022405205213 has 2 divisors, whose sum is σ = 21022405205214. Its totient is φ = 21022405205212.

The previous prime is 21022405205209. The next prime is 21022405205231. The reversal of 21022405205213 is 31250250422012.

It is a happy number.

Together with next prime (21022405205231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13090307510809 + 7932097694404 = 3618053^2 + 2816398^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022405205213 - 2² = 21022405205209 is a prime.

It is a super-2 number, since 2×21022405205213² (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 (21022405205413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511202602606 + 10511202602607.

It is an arithmetic number, because the mean of its divisors is an integer number (10511202602607).

Almost surely, 2^{21022405205213} is an apocalyptic number.

It is an amenable number.

21022405205213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022405205213 is an equidigital number, since it uses as much as digits as its factorization.

21022405205213 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21022405205213 its reverse (31250250422012), we get a palindrome (52272655627225).

The spelling of 21022405205213 in words is "twenty-one trillion, twenty-two billion, four hundred five million, two hundred five thousand, two hundred thirteen".