16221477097 has 6 divisors (see below), whose sum is σ = 18869881578. Its totient is φ = 13904123184.

The previous prime is 16221477059. The next prime is 16221477101. The reversal of 16221477097 is 79077412261.

It can be written as a sum of positive squares in only one way, i.e., 13489428736 + 2732048361 = 116144^2 + 52269^2 .

It is not a de Polignac number, because 16221477097 - 2³¹ = 14073993449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16221477037) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 165525228 + ... + 165525325.

It is an arithmetic number, because the mean of its divisors is an integer number (3144980263).

Almost surely, 2^16221477097 is an apocalyptic number.

It is an amenable number.

16221477097 is a deficient number, since it is larger than the sum of its proper divisors (2648404481).

16221477097 is an equidigital number, since it uses as much as digits as its factorization.

16221477097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331050567 (or 331050560 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 46.

The spelling of 16221477097 in words is "sixteen billion, two hundred twenty-one million, four hundred seventy-seven thousand, ninety-seven".