16321401 has 12 divisors (see below), whose sum is σ = 23928112. Its totient is φ = 10718136.

The previous prime is 16321397. The next prime is 16321423. The reversal of 16321401 is 10412361.

It is a happy number.

It is not a de Polignac number, because 16321401 - 2² = 16321397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16321441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12931 + ... + 14136.

Almost surely, 2^16321401 is an apocalyptic number.

It is an amenable number.

16321401 is a deficient number, since it is larger than the sum of its proper divisors (7606711).

16321401 is a wasteful number, since it uses less digits than its factorization.

16321401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27140 (or 27137 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 16321401 is about 4039.9753712121. The cubic root of 16321401 is about 253.6602863388.

Adding to 16321401 its reverse (10412361), we get a palindrome (26733762).

The spelling of 16321401 in words is "sixteen million, three hundred twenty-one thousand, four hundred one".