13221656498 has 6 divisors (see below), whose sum is σ = 19832728671. Its totient is φ = 6610746942.

The previous prime is 13221656477. The next prime is 13221656533. The reversal of 13221656498 is 89465612231.

It can be written as a sum of positive squares in only one way, i.e., 6610828249 + 6610828249 = 81307^2 + 81307^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=81307.

It is a super-2 number, since 2×13221656498² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 121961 + ... + 203267.

Almost surely, 2^13221656498 is an apocalyptic number.

13221656498 is a deficient number, since it is larger than the sum of its proper divisors (6611072173).

13221656498 is an frugal number, since it uses more digits than its factorization.

13221656498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162616 (or 81309 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The spelling of 13221656498 in words is "thirteen billion, two hundred twenty-one million, six hundred fifty-six thousand, four hundred ninety-eight".