16421207 has 8 divisors (see below), whose sum is σ = 17969040. Its totient is φ = 14882560.

The previous prime is 16421203. The next prime is 16421213. The reversal of 16421207 is 70212461.

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

It is not a de Polignac number, because 16421207 - 2² = 16421203 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 (16421203) 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, 1769 + ... + 5997.

It is an arithmetic number, because the mean of its divisors is an integer number (2246130).

Almost surely, 2^16421207 is an apocalyptic number.

16421207 is a deficient number, since it is larger than the sum of its proper divisors (1547833).

16421207 is a wasteful number, since it uses less digits than its factorization.

16421207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4593.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 16421207 is about 4052.3088480519. The cubic root of 16421207 is about 254.1762834786.

Adding to 16421207 its reverse (70212461), we get a palindrome (86633668).

The spelling of 16421207 in words is "sixteen million, four hundred twenty-one thousand, two hundred seven".