16621073 has 4 divisors (see below), whose sum is σ = 18995520. Its totient is φ = 14246628.

The previous prime is 16621069. The next prime is 16621079. The reversal of 16621073 is 37012661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37012661 = 7 ⋅5287523.

It is a cyclic number.

It is not a de Polignac number, because 16621073 - 2² = 16621069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16621079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1187213 + ... + 1187226.

It is an arithmetic number, because the mean of its divisors is an integer number (4748880).

Almost surely, 2^16621073 is an apocalyptic number.

It is an amenable number.

16621073 is a deficient number, since it is larger than the sum of its proper divisors (2374447).

16621073 is an equidigital number, since it uses as much as digits as its factorization.

16621073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374446.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 16621073 is about 4076.8950194971. The cubic root of 16621073 is about 255.2033390302.

The spelling of 16621073 in words is "sixteen million, six hundred twenty-one thousand, seventy-three".