21244512413 has 2 divisors, whose sum is σ = 21244512414. Its totient is φ = 21244512412.

The previous prime is 21244512353. The next prime is 21244512431. The reversal of 21244512413 is 31421544212.

It is a happy number.

Together with next prime (21244512431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19177264324 + 2067248089 = 138482^2 + 45467^2 .

It is a cyclic number.

It is not a de Polignac number, because 21244512413 - 2²⁶ = 21177403549 is a prime.

It is a super-2 number, since 2×21244512413² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21244512473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622256206 + 10622256207.

It is an arithmetic number, because the mean of its divisors is an integer number (10622256207).

Almost surely, 2^21244512413 is an apocalyptic number.

It is an amenable number.

21244512413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21244512413 is an equidigital number, since it uses as much as digits as its factorization.

21244512413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 29.

The spelling of 21244512413 in words is "twenty-one billion, two hundred forty-four million, five hundred twelve thousand, four hundred thirteen".