21312021301289 has 2 divisors, whose sum is σ = 21312021301290. Its totient is φ = 21312021301288.

The previous prime is 21312021301271. The next prime is 21312021301349. The reversal of 21312021301289 is 98210312021312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19942547941264 + 1369473360025 = 4465708^2 + 1170245^2 .

It is a cyclic number.

It is not a de Polignac number, because 21312021301289 - 2²⁰ = 21312020252713 is a prime.

It is not a weakly prime, because it can be changed into another prime (21312021301489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656010650644 + 10656010650645.

It is an arithmetic number, because the mean of its divisors is an integer number (10656010650645).

Almost surely, 2^{21312021301289} is an apocalyptic number.

It is an amenable number.

21312021301289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312021301289 is an equidigital number, since it uses as much as digits as its factorization.

21312021301289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 21312021301289 in words is "twenty-one trillion, three hundred twelve billion, twenty-one million, three hundred one thousand, two hundred eighty-nine".