21960318481349 has 2 divisors, whose sum is σ = 21960318481350. Its totient is φ = 21960318481348.

The previous prime is 21960318481337. The next prime is 21960318481351. The reversal of 21960318481349 is 94318481306912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14790616064449 + 7169702416900 = 3845857^2 + 2677630^2 .

It is a cyclic number.

It is not a de Polignac number, because 21960318481349 - 2⁴ = 21960318481333 is a prime.

Together with 21960318481351, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21960318481369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10980159240674 + 10980159240675.

It is an arithmetic number, because the mean of its divisors is an integer number (10980159240675).

Almost surely, 2^{21960318481349} is an apocalyptic number.

It is an amenable number.

21960318481349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21960318481349 is an equidigital number, since it uses as much as digits as its factorization.

21960318481349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8957952, while the sum is 59.

The spelling of 21960318481349 in words is "twenty-one trillion, nine hundred sixty billion, three hundred eighteen million, four hundred eighty-one thousand, three hundred forty-nine".