21310330301921 has 2 divisors, whose sum is σ = 21310330301922. Its totient is φ = 21310330301920.

The previous prime is 21310330301917. The next prime is 21310330301959. The reversal of 21310330301921 is 12910303301312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14931114246400 + 6379216055521 = 3864080^2 + 2525711^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310330301921 - 2² = 21310330301917 is a prime.

It is not a weakly prime, because it can be changed into another prime (21310330306921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655165150960 + 10655165150961.

It is an arithmetic number, because the mean of its divisors is an integer number (10655165150961).

Almost surely, 2^{21310330301921} is an apocalyptic number.

It is an amenable number.

21310330301921 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310330301921 is an equidigital number, since it uses as much as digits as its factorization.

21310330301921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

The spelling of 21310330301921 in words is "twenty-one trillion, three hundred ten billion, three hundred thirty million, three hundred one thousand, nine hundred twenty-one".