21312021302311 has 2 divisors, whose sum is σ = 21312021302312. Its totient is φ = 21312021302310.

The previous prime is 21312021302303. The next prime is 21312021302321. The reversal of 21312021302311 is 11320312021312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21312021302311 - 2³ = 21312021302303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21312021302321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656010651155 + 10656010651156.

It is an arithmetic number, because the mean of its divisors is an integer number (10656010651156).

Almost surely, 2^{21312021302311} is an apocalyptic number.

21312021302311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312021302311 is an equidigital number, since it uses as much as digits as its factorization.

21312021302311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21312021302311 its reverse (11320312021312), we get a palindrome (32632333323623).

The spelling of 21312021302311 in words is "twenty-one trillion, three hundred twelve billion, twenty-one million, three hundred two thousand, three hundred eleven".