21313100330947 has 2 divisors, whose sum is σ = 21313100330948. Its totient is φ = 21313100330946.

The previous prime is 21313100330909. The next prime is 21313100330993. The reversal of 21313100330947 is 74903300131312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21313100330947 - 2³⁵ = 21278740592579 is a prime.

It is not a weakly prime, because it can be changed into another prime (21313100330747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656550165473 + 10656550165474.

It is an arithmetic number, because the mean of its divisors is an integer number (10656550165474).

Almost surely, 2^{21313100330947} is an apocalyptic number.

21313100330947 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313100330947 is an equidigital number, since it uses as much as digits as its factorization.

21313100330947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 37.

The spelling of 21313100330947 in words is "twenty-one trillion, three hundred thirteen billion, one hundred million, three hundred thirty thousand, nine hundred forty-seven".