210030121 has 24 divisors (see below), whose sum is σ = 261691560. Its totient is φ = 167473152.

The previous prime is 210030113. The next prime is 210030211. The reversal of 210030121 is 121030012.

It can be written as a sum of positive squares in 4 ways, for example, as 20830096 + 189200025 = 4564^2 + 13755^2 .

It is not a de Polignac number, because 210030121 - 2³ = 210030113 is a prime.

It is a super-2 number, since 2×210030121² = 88225303454549282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210030098 and 210030107.

It is not an unprimeable number, because it can be changed into a prime (210030101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72721 + ... + 75553.

It is an arithmetic number, because the mean of its divisors is an integer number (10903815).

Almost surely, 2^210030121 is an apocalyptic number.

It is an amenable number.

210030121 is a deficient number, since it is larger than the sum of its proper divisors (51661439).

210030121 is a wasteful number, since it uses less digits than its factorization.

210030121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953 (or 2946 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 210030121 is about 14492.4159821612. The cubic root of 210030121 is about 594.4206124690.

Adding to 210030121 its reverse (121030012), we get a palindrome (331060133).

The spelling of 210030121 in words is "two hundred ten million, thirty thousand, one hundred twenty-one".