21310301434991 has 2 divisors, whose sum is σ = 21310301434992. Its totient is φ = 21310301434990.

The previous prime is 21310301434949. The next prime is 21310301435099. The reversal of 21310301434991 is 19943410301312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21310301434991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310301434901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655150717495 + 10655150717496.

It is an arithmetic number, because the mean of its divisors is an integer number (10655150717496).

Almost surely, 2^{21310301434991} is an apocalyptic number.

21310301434991 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310301434991 is an equidigital number, since it uses as much as digits as its factorization.

21310301434991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 41.

The spelling of 21310301434991 in words is "twenty-one trillion, three hundred ten billion, three hundred one million, four hundred thirty-four thousand, nine hundred ninety-one".