21020313331349 has 2 divisors, whose sum is σ = 21020313331350. Its totient is φ = 21020313331348.

The previous prime is 21020313331289. The next prime is 21020313331393. The reversal of 21020313331349 is 94313331302012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20157244461124 + 863068870225 = 4489682^2 + 929015^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020313331349 - 2⁸ = 21020313331093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020313336349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510156665674 + 10510156665675.

It is an arithmetic number, because the mean of its divisors is an integer number (10510156665675).

Almost surely, 2^{21020313331349} is an apocalyptic number.

It is an amenable number.

21020313331349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020313331349 is an equidigital number, since it uses as much as digits as its factorization.

21020313331349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 35.

The spelling of 21020313331349 in words is "twenty-one trillion, twenty billion, three hundred thirteen million, three hundred thirty-one thousand, three hundred forty-nine".