13021643456 has 14 divisors (see below), whose sum is σ = 25839823860. Its totient is φ = 6510821696.

The previous prime is 13021643413. The next prime is 13021643477. The reversal of 13021643456 is 65434612031.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101731526 + ... + 101731653.

Almost surely, 2^13021643456 is an apocalyptic number.

13021643456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13021643456 is a deficient number, since it is larger than the sum of its proper divisors (12818180404).

13021643456 is an equidigital number, since it uses as much as digits as its factorization.

13021643456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203463191 (or 203463181 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 13021643456 in words is "thirteen billion, twenty-one million, six hundred forty-three thousand, four hundred fifty-six".