212121131 has 4 divisors (see below), whose sum is σ = 212167200. Its totient is φ = 212075064.

The previous prime is 212121113. The next prime is 212121139. The reversal of 212121131 is 131121212.

212121131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 212121131 - 2⁶ = 212121067 is a prime.

It is a super-2 number, since 2×212121131² = 89990748433438322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212121139) 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, 15251 + ... + 25628.

It is an arithmetic number, because the mean of its divisors is an integer number (53041800).

Almost surely, 2^212121131 is an apocalyptic number.

212121131 is a deficient number, since it is larger than the sum of its proper divisors (46069).

212121131 is an equidigital number, since it uses as much as digits as its factorization.

212121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46068.

The product of its digits is 24, while the sum is 14.

The square root of 212121131 is about 14564.3788401703. The cubic root of 212121131 is about 596.3867388823.

Adding to 212121131 its reverse (131121212), we get a palindrome (343242343).

The spelling of 212121131 in words is "two hundred twelve million, one hundred twenty-one thousand, one hundred thirty-one".