16211121 has 8 divisors (see below), whose sum is σ = 21635520. Its totient is φ = 10797072.

The previous prime is 16211101. The next prime is 16211189. The reversal of 16211121 is 12111261.

It is a happy number.

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

It is not a de Polignac number, because 16211121 - 2⁷ = 16210993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16211121.

It is not an unprimeable number, because it can be changed into a prime (16211101) 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, 2500 + ... + 6218.

It is an arithmetic number, because the mean of its divisors is an integer number (2704440).

Almost surely, 2^16211121 is an apocalyptic number.

It is an amenable number.

16211121 is a deficient number, since it is larger than the sum of its proper divisors (5424399).

16211121 is a wasteful number, since it uses less digits than its factorization.

16211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5175.

The product of its digits is 24, while the sum is 15.

The square root of 16211121 is about 4026.3036398166. The cubic root of 16211121 is about 253.0876864370.

Adding to 16211121 its reverse (12111261), we get a palindrome (28322382).

The spelling of 16211121 in words is "sixteen million, two hundred eleven thousand, one hundred twenty-one".