210440121 has 16 divisors (see below), whose sum is σ = 293314560. Its totient is φ = 134044560.

The previous prime is 210440119. The next prime is 210440137. The reversal of 210440121 is 121044012.

It is not a de Polignac number, because 210440121 - 2¹ = 210440119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210440121.

It is not an unprimeable number, because it can be changed into a prime (210440621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6975 + ... + 21668.

It is an arithmetic number, because the mean of its divisors is an integer number (18332160).

Almost surely, 2^210440121 is an apocalyptic number.

It is an amenable number.

210440121 is a deficient number, since it is larger than the sum of its proper divisors (82874439).

210440121 is a wasteful number, since it uses less digits than its factorization.

210440121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28756.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 210440121 is about 14506.5544151601. The cubic root of 210440121 is about 594.8071507394.

Adding to 210440121 its reverse (121044012), we get a palindrome (331484133).

The spelling of 210440121 in words is "two hundred ten million, four hundred forty thousand, one hundred twenty-one".