210993121 has 8 divisors (see below), whose sum is σ = 213955200. Its totient is φ = 208038480.

The previous prime is 210993113. The next prime is 210993127. The reversal of 210993121 is 121399012.

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 210993121 - 2³ = 210993113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210993121.

It is not an unprimeable number, because it can be changed into a prime (210993127) 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 7 ways as a sum of consecutive naturals, for example, 79191 + ... + 81811.

It is an arithmetic number, because the mean of its divisors is an integer number (26744400).

Almost surely, 2^210993121 is an apocalyptic number.

It is an amenable number.

210993121 is a deficient number, since it is larger than the sum of its proper divisors (2962079).

210993121 is a wasteful number, since it uses less digits than its factorization.

210993121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3719.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 210993121 is about 14525.6022594590. The cubic root of 210993121 is about 595.3277115693.

The spelling of 210993121 in words is "two hundred ten million, nine hundred ninety-three thousand, one hundred twenty-one".