16572121 has 4 divisors (see below), whose sum is σ = 17292672. Its totient is φ = 15851572.

The previous prime is 16572119. The next prime is 16572139. The reversal of 16572121 is 12127561.

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: 12127561 = 557 ⋅21773.

It is a cyclic number.

It is not a de Polignac number, because 16572121 - 2¹ = 16572119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16572221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360241 + ... + 360286.

It is an arithmetic number, because the mean of its divisors is an integer number (4323168).

Almost surely, 2^16572121 is an apocalyptic number.

It is an amenable number.

16572121 is a deficient number, since it is larger than the sum of its proper divisors (720551).

16572121 is an equidigital number, since it uses as much as digits as its factorization.

16572121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720550.

The product of its digits is 840, while the sum is 25.

The square root of 16572121 is about 4070.8870040815. The cubic root of 16572121 is about 254.9525530074.

Adding to 16572121 its reverse (12127561), we get a palindrome (28699682).

The spelling of 16572121 in words is "sixteen million, five hundred seventy-two thousand, one hundred twenty-one".