210131121 has 8 divisors (see below), whose sum is σ = 280242144. Its totient is φ = 140053760.

The previous prime is 210131111. The next prime is 210131123. The reversal of 210131121 is 121131012.

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 210131121 - 2⁶ = 210131057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210131097 and 210131106.

It is not an unprimeable number, because it can be changed into a prime (210131123) 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, 18001 + ... + 27281.

It is an arithmetic number, because the mean of its divisors is an integer number (35030268).

Almost surely, 2^210131121 is an apocalyptic number.

It is an amenable number.

210131121 is a deficient number, since it is larger than the sum of its proper divisors (70111023).

210131121 is an equidigital number, since it uses as much as digits as its factorization.

210131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16831.

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

The square root of 210131121 is about 14495.9001445236. The cubic root of 210131121 is about 594.5158795361.

Adding to 210131121 its reverse (121131012), we get a palindrome (331262133).

The spelling of 210131121 in words is "two hundred ten million, one hundred thirty-one thousand, one hundred twenty-one".