16229978221 has 8 divisors (see below), whose sum is σ = 16945580160. Its totient is φ = 15515205552.

The previous prime is 16229978189. The next prime is 16229978263. The reversal of 16229978221 is 12287992261.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16229978221 - 2⁵ = 16229978189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16229978291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167145 + ... + 245758.

It is an arithmetic number, because the mean of its divisors is an integer number (2118197520).

Almost surely, 2^16229978221 is an apocalyptic number.

It is an amenable number.

16229978221 is a deficient number, since it is larger than the sum of its proper divisors (715601939).

16229978221 is a wasteful number, since it uses less digits than its factorization.

16229978221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414635.

The product of its digits is 435456, while the sum is 49.

The spelling of 16229978221 in words is "sixteen billion, two hundred twenty-nine million, nine hundred seventy-eight thousand, two hundred twenty-one".