21231401413 has 2 divisors, whose sum is σ = 21231401414. Its totient is φ = 21231401412.

The previous prime is 21231401393. The next prime is 21231401431. The reversal of 21231401413 is 31410413212.

Together with next prime (21231401431) 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., 20222830849 + 1008570564 = 142207^2 + 31758^2 .

It is a cyclic number.

It is not a de Polignac number, because 21231401413 - 2¹³ = 21231393221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231401483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615700706 + 10615700707.

It is an arithmetic number, because the mean of its divisors is an integer number (10615700707).

Almost surely, 2^21231401413 is an apocalyptic number.

It is an amenable number.

21231401413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231401413 is an equidigital number, since it uses as much as digits as its factorization.

21231401413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21231401413 its reverse (31410413212), we get a palindrome (52641814625).

The spelling of 21231401413 in words is "twenty-one billion, two hundred thirty-one million, four hundred one thousand, four hundred thirteen".