212170705 has 4 divisors (see below), whose sum is σ = 254604852. Its totient is φ = 169736560.

The previous prime is 212170687. The next prime is 212170733. The reversal of 212170705 is 507071212.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45037521 + 167133184 = 6711^2 + 12928^2 .

It is not a de Polignac number, because 212170705 - 2¹³ = 212162513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212170705.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21217066 + ... + 21217075.

It is an arithmetic number, because the mean of its divisors is an integer number (63651213).

Almost surely, 2^212170705 is an apocalyptic number.

It is an amenable number.

212170705 is a deficient number, since it is larger than the sum of its proper divisors (42434147).

212170705 is an equidigital number, since it uses as much as digits as its factorization.

212170705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42434146.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 212170705 is about 14566.0806327577. The cubic root of 212170705 is about 596.4331950009.

The spelling of 212170705 in words is "two hundred twelve million, one hundred seventy thousand, seven hundred five".