13021123081 has 2 divisors, whose sum is σ = 13021123082. Its totient is φ = 13021123080.

The previous prime is 13021123061. The next prime is 13021123117. The reversal of 13021123081 is 18032112031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7518450681 + 5502672400 = 86709^2 + 74180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13021123081 is a prime.

It is a super-2 number, since 2×13021123081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13021123061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6510561540 + 6510561541.

It is an arithmetic number, because the mean of its divisors is an integer number (6510561541).

Almost surely, 2^13021123081 is an apocalyptic number.

It is an amenable number.

13021123081 is a deficient number, since it is larger than the sum of its proper divisors (1).

13021123081 is an equidigital number, since it uses as much as digits as its factorization.

13021123081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 13021123081 in words is "thirteen billion, twenty-one million, one hundred twenty-three thousand, eighty-one".