16221547297 has 4 divisors (see below), whose sum is σ = 16306477056. Its totient is φ = 16136617540.

The previous prime is 16221547273. The next prime is 16221547327. The reversal of 16221547297 is 79274512261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16221547297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16221547207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42464593 + ... + 42464974.

It is an arithmetic number, because the mean of its divisors is an integer number (4076619264).

Almost surely, 2^16221547297 is an apocalyptic number.

It is an amenable number.

16221547297 is a deficient number, since it is larger than the sum of its proper divisors (84929759).

16221547297 is an equidigital number, since it uses as much as digits as its factorization.

16221547297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84929758.

The product of its digits is 423360, while the sum is 46.

The spelling of 16221547297 in words is "sixteen billion, two hundred twenty-one million, five hundred forty-seven thousand, two hundred ninety-seven".