21244122413 has 2 divisors, whose sum is σ = 21244122414. Its totient is φ = 21244122412.

The previous prime is 21244122377. The next prime is 21244122457. The reversal of 21244122413 is 31422144212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21152211844 + 91910569 = 145438^2 + 9587^2 .

It is a cyclic number.

It is not a de Polignac number, because 21244122413 - 2¹⁰ = 21244121389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21244122113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622061206 + 10622061207.

It is an arithmetic number, because the mean of its divisors is an integer number (10622061207).

Almost surely, 2^21244122413 is an apocalyptic number.

It is an amenable number.

21244122413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21244122413 is an equidigital number, since it uses as much as digits as its factorization.

21244122413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 26.

Adding to 21244122413 its reverse (31422144212), we get a palindrome (52666266625).

The spelling of 21244122413 in words is "twenty-one billion, two hundred forty-four million, one hundred twenty-two thousand, four hundred thirteen".