16620121 has 8 divisors (see below), whose sum is σ = 19306304. Its totient is φ = 14011920.

The previous prime is 16620119. The next prime is 16620137. The reversal of 16620121 is 12102661.

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

It is a cyclic number.

It is not a de Polignac number, because 16620121 - 2¹ = 16620119 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (16620521) 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, 19035 + ... + 19888.

It is an arithmetic number, because the mean of its divisors is an integer number (2413288).

Almost surely, 2^16620121 is an apocalyptic number.

It is an amenable number.

16620121 is a deficient number, since it is larger than the sum of its proper divisors (2686183).

16620121 is an equidigital number, since it uses as much as digits as its factorization.

16620121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38991.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 16620121 is about 4076.7782623047. The cubic root of 16620121 is about 255.1984665366.

Adding to 16620121 its reverse (12102661), we get a palindrome (28722782).

The spelling of 16620121 in words is "sixteen million, six hundred twenty thousand, one hundred twenty-one".