21320122049 has 2 divisors, whose sum is σ = 21320122050. Its totient is φ = 21320122048.

The previous prime is 21320122003. The next prime is 21320122051. The reversal of 21320122049 is 94022102312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14269497025 + 7050625024 = 119455^2 + 83968^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21320122049 is a prime.

Together with 21320122051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21320122069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660061024 + 10660061025.

It is an arithmetic number, because the mean of its divisors is an integer number (10660061025).

Almost surely, 2^21320122049 is an apocalyptic number.

It is an amenable number.

21320122049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320122049 is an equidigital number, since it uses as much as digits as its factorization.

21320122049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 21320122049 in words is "twenty-one billion, three hundred twenty million, one hundred twenty-two thousand, forty-nine".