16419603321 has 45 divisors (see below), whose sum is σ = 26162878495. Its totient is φ = 9923084160.

The previous prime is 16419603311. The next prime is 16419603337. The reversal of 16419603321 is 12330691461.

The square root of 16419603321 is 128139.

It is a perfect power (a square), and thus also a powerful number.

16419603321 is a `hidden beast` number, since 1 + 6 + 4 + 19 + 603 + 32 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6670805625 + 9748797696 = 81675^2 + 98736^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16419603321 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16419603301) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 46514281 + ... + 46514633.

Almost surely, 2^16419603321 is an apocalyptic number.

16419603321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16419603321 is the 128139-th square number.

16419603321 is the 64070-th centered octagonal number.

It is an amenable number.

16419603321 is a deficient number, since it is larger than the sum of its proper divisors (9743275174).

16419603321 is an frugal number, since it uses more digits than its factorization.

16419603321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

Multiplying 16419603321 by its sum of digits (36), we get a square (591105719556 = 768834²).

The spelling of 16419603321 in words is "sixteen billion, four hundred nineteen million, six hundred three thousand, three hundred twenty-one".