21403003613 has 2 divisors, whose sum is σ = 21403003614. Its totient is φ = 21403003612.

The previous prime is 21403003591. The next prime is 21403003619. The reversal of 21403003613 is 31630030412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13314159769 + 8088843844 = 115387^2 + 89938^2 .

It is a cyclic number.

It is not a de Polignac number, because 21403003613 - 2⁸ = 21403003357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21403003619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701501806 + 10701501807.

It is an arithmetic number, because the mean of its divisors is an integer number (10701501807).

Almost surely, 2^21403003613 is an apocalyptic number.

It is an amenable number.

21403003613 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403003613 is an equidigital number, since it uses as much as digits as its factorization.

21403003613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

The spelling of 21403003613 in words is "twenty-one billion, four hundred three million, three thousand, six hundred thirteen".