16722131 has 4 divisors (see below), whose sum is σ = 16749264. Its totient is φ = 16695000.

The previous prime is 16722103. The next prime is 16722149. The reversal of 16722131 is 13122761.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16722131 - 2¹⁸ = 16459987 is a prime.

It is a super-2 number, since 2×16722131² = 559259330362322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16722097 and 16722106.

It is not an unprimeable number, because it can be changed into a prime (16722151) 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, 12620 + ... + 13881.

It is an arithmetic number, because the mean of its divisors is an integer number (4187316).

Almost surely, 2^16722131 is an apocalyptic number.

16722131 is a deficient number, since it is larger than the sum of its proper divisors (27133).

16722131 is an equidigital number, since it uses as much as digits as its factorization.

16722131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27132.

The product of its digits is 504, while the sum is 23.

The square root of 16722131 is about 4089.2702282926. The cubic root of 16722131 is about 255.7195160041.

Adding to 16722131 its reverse (13122761), we get a palindrome (29844892).

The spelling of 16722131 in words is "sixteen million, seven hundred twenty-two thousand, one hundred thirty-one".