210201121 has 4 divisors (see below), whose sum is σ = 226370452. Its totient is φ = 194031792.

The previous prime is 210201083. The next prime is 210201139. The reversal of 210201121 is 121102012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133726096 + 76475025 = 11564^2 + 8745^2 .

It is a cyclic number.

It is not a de Polignac number, because 210201121 - 2⁹ = 210200609 is a prime.

It is a super-2 number, since 2×210201121² = 88369022539313282, 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 = 210201098 and 210201107.

It is not an unprimeable number, because it can be changed into a prime (210201191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8084646 + ... + 8084671.

It is an arithmetic number, because the mean of its divisors is an integer number (56592613).

Almost surely, 2^210201121 is an apocalyptic number.

It is an amenable number.

210201121 is a deficient number, since it is larger than the sum of its proper divisors (16169331).

210201121 is a wasteful number, since it uses less digits than its factorization.

210201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16169330.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 210201121 is about 14498.3144192696. The cubic root of 210201121 is about 594.5818883074.

Adding to 210201121 its reverse (121102012), we get a palindrome (331303133).

The spelling of 210201121 in words is "two hundred ten million, two hundred one thousand, one hundred twenty-one".