13000221997 has 24 divisors (see below), whose sum is σ = 16035050304. Its totient is φ = 10472660352.

The previous prime is 13000221991. The next prime is 13000222021. The reversal of 13000221997 is 79912200031.

It is a happy number.

It is not a de Polignac number, because 13000221997 - 2⁷ = 13000221869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13000221991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 594858 + ... + 616324.

It is an arithmetic number, because the mean of its divisors is an integer number (668127096).

Almost surely, 2^13000221997 is an apocalyptic number.

13000221997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

13000221997 is a deficient number, since it is larger than the sum of its proper divisors (3034828307).

13000221997 is a wasteful number, since it uses less digits than its factorization.

13000221997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22225 (or 22218 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 34.

The spelling of 13000221997 in words is "thirteen billion, two hundred twenty-one thousand, nine hundred ninety-seven".