212132191 has 4 divisors (see below), whose sum is σ = 212164552. Its totient is φ = 212099832.

The previous prime is 212132189. The next prime is 212132213. The reversal of 212132191 is 191231212.

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 212132191 - 2¹ = 212132189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212132491) 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, 2481 + ... + 20746.

It is an arithmetic number, because the mean of its divisors is an integer number (53041138).

Almost surely, 2^212132191 is an apocalyptic number.

212132191 is a deficient number, since it is larger than the sum of its proper divisors (32361).

212132191 is an equidigital number, since it uses as much as digits as its factorization.

212132191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32360.

The product of its digits is 216, while the sum is 22.

The square root of 212132191 is about 14564.7585287227. The cubic root of 212132191 is about 596.3971039076.

The spelling of 212132191 in words is "two hundred twelve million, one hundred thirty-two thousand, one hundred ninety-one".