212873891 has 16 divisors (see below), whose sum is σ = 233030400. Its totient is φ = 193687200.

The previous prime is 212873887. The next prime is 212873897. The reversal of 212873891 is 198378212.

It is a cyclic number.

It is not a de Polignac number, because 212873891 - 2² = 212873887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212873897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115346 + ... + 117176.

It is an arithmetic number, because the mean of its divisors is an integer number (14564400).

Almost surely, 2^212873891 is an apocalyptic number.

212873891 is a deficient number, since it is larger than the sum of its proper divisors (20156509).

212873891 is a wasteful number, since it uses less digits than its factorization.

212873891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090.

The product of its digits is 48384, while the sum is 41.

The square root of 212873891 is about 14590.1984564981. The cubic root of 212873891 is about 597.0913772704.

The spelling of 212873891 in words is "two hundred twelve million, eight hundred seventy-three thousand, eight hundred ninety-one".