21312122999983 has 2 divisors, whose sum is σ = 21312122999984. Its totient is φ = 21312122999982.

The previous prime is 21312122999969. The next prime is 21312123000013. The reversal of 21312122999983 is 38999922121312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21312122999983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21312122999903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656061499991 + 10656061499992.

It is an arithmetic number, because the mean of its divisors is an integer number (10656061499992).

Almost surely, 2^{21312122999983} is an apocalyptic number.

21312122999983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312122999983 is an equidigital number, since it uses as much as digits as its factorization.

21312122999983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7558272, while the sum is 61.

The spelling of 21312122999983 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty-two million, nine hundred ninety-nine thousand, nine hundred eighty-three".