210121131 has 16 divisors (see below), whose sum is σ = 315491328. Its totient is φ = 123237600.

The previous prime is 210121103. The next prime is 210121151. The reversal of 210121131 is 131121012.

It is not a de Polignac number, because 210121131 - 2²⁷ = 75903403 is a prime.

It is a super-2 number, since 2×210121131² = 88301779385438322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (210121151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101676 + ... + 103721.

It is an arithmetic number, because the mean of its divisors is an integer number (19718208).

Almost surely, 2^210121131 is an apocalyptic number.

210121131 is a deficient number, since it is larger than the sum of its proper divisors (105370197).

210121131 is a wasteful number, since it uses less digits than its factorization.

210121131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205442.

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

The square root of 210121131 is about 14495.5555602398. Note that the first 4 decimals coincide. The cubic root of 210121131 is about 594.5064579462.

Adding to 210121131 its reverse (131121012), we get a palindrome (341242143).

It can be divided in two parts, 2101 and 21131, that added together give a palindrome (23232).

The spelling of 210121131 in words is "two hundred ten million, one hundred twenty-one thousand, one hundred thirty-one".