212111131 has 4 divisors (see below), whose sum is σ = 217043992. Its totient is φ = 207178272.

The previous prime is 212111111. The next prime is 212111147. The reversal of 212111131 is 131111212.

It is a happy number.

212111131 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 212111131 - 2⁵ = 212111099 is a prime.

It is a super-2 number, since 2×212111131² = 89982263788198322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212111101) 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, 2466366 + ... + 2466451.

It is an arithmetic number, because the mean of its divisors is an integer number (54260998).

Almost surely, 2^212111131 is an apocalyptic number.

212111131 is a deficient number, since it is larger than the sum of its proper divisors (4932861).

212111131 is an equidigital number, since it uses as much as digits as its factorization.

212111131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4932860.

The product of its digits is 12, while the sum is 13.

The square root of 212111131 is about 14564.0355327773. The cubic root of 212111131 is about 596.3773669398.

Adding to 212111131 its reverse (131111212), we get a palindrome (343222343).

The spelling of 212111131 in words is "two hundred twelve million, one hundred eleven thousand, one hundred thirty-one".