21310144312309 has 2 divisors, whose sum is σ = 21310144312310. Its totient is φ = 21310144312308.

The previous prime is 21310144312279. The next prime is 21310144312349. The reversal of 21310144312309 is 90321344101312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21259273765284 + 50870547025 = 4610778^2 + 225545^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310144312309 - 2¹¹ = 21310144310261 is a prime.

It is a super-2 number, since 2×21310144312309² (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 (21310144312349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655072156154 + 10655072156155.

It is an arithmetic number, because the mean of its divisors is an integer number (10655072156155).

Almost surely, 2^{21310144312309} is an apocalyptic number.

It is an amenable number.

21310144312309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310144312309 is an equidigital number, since it uses as much as digits as its factorization.

21310144312309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 21310144312309 in words is "twenty-one trillion, three hundred ten billion, one hundred forty-four million, three hundred twelve thousand, three hundred nine".