212030857 has 4 divisors (see below), whose sum is σ = 212392656. Its totient is φ = 211669060.

The previous prime is 212030809. The next prime is 212030869. The reversal of 212030857 is 758030212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212030857 - 2⁷ = 212030729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212030257) 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 3 ways as a sum of consecutive naturals, for example, 180019 + ... + 181192.

It is an arithmetic number, because the mean of its divisors is an integer number (53098164).

Almost surely, 2^212030857 is an apocalyptic number.

It is an amenable number.

212030857 is a deficient number, since it is larger than the sum of its proper divisors (361799).

212030857 is an equidigital number, since it uses as much as digits as its factorization.

212030857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361798.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 212030857 is about 14561.2793737364. The cubic root of 212030857 is about 596.3021239338.

The spelling of 212030857 in words is "two hundred twelve million, thirty thousand, eight hundred fifty-seven".