13701257720321 has 2 divisors, whose sum is σ = 13701257720322. Its totient is φ = 13701257720320.

The previous prime is 13701257720203. The next prime is 13701257720357. The reversal of 13701257720321 is 12302775210731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8036686359025 + 5664571361296 = 2834905^2 + 2380036^2 .

It is a cyclic number.

It is not a de Polignac number, because 13701257720321 - 2²⁶ = 13701190611457 is a prime.

It is not a weakly prime, because it can be changed into another prime (13701257740321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6850628860160 + 6850628860161.

It is an arithmetic number, because the mean of its divisors is an integer number (6850628860161).

Almost surely, 2^{13701257720321} is an apocalyptic number.

It is an amenable number.

13701257720321 is a deficient number, since it is larger than the sum of its proper divisors (1).

13701257720321 is an equidigital number, since it uses as much as digits as its factorization.

13701257720321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 123480, while the sum is 41.

The spelling of 13701257720321 in words is "thirteen trillion, seven hundred one billion, two hundred fifty-seven million, seven hundred twenty thousand, three hundred twenty-one".