21321003203113 has 2 divisors, whose sum is σ = 21321003203114. Its totient is φ = 21321003203112.

The previous prime is 21321003203107. The next prime is 21321003203147. The reversal of 21321003203113 is 31130230012312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10896389737024 + 10424613466089 = 3300968^2 + 3228717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321003203113 is a prime.

It is not a weakly prime, because it can be changed into another prime (21321003203183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660501601556 + 10660501601557.

It is an arithmetic number, because the mean of its divisors is an integer number (10660501601557).

Almost surely, 2^{21321003203113} is an apocalyptic number.

It is an amenable number.

21321003203113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321003203113 is an equidigital number, since it uses as much as digits as its factorization.

21321003203113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21321003203113 its reverse (31130230012312), we get a palindrome (52451233215425).

The spelling of 21321003203113 in words is "twenty-one trillion, three hundred twenty-one billion, three million, two hundred three thousand, one hundred thirteen".