212164385 has 4 divisors (see below), whose sum is σ = 254597268. Its totient is φ = 169731504.

The previous prime is 212164373. The next prime is 212164409. The reversal of 212164385 is 583461212.

212164385 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 can be written as a sum of positive squares in 2 ways, for example, as 73136704 + 139027681 = 8552^2 + 11791^2 .

It is a cyclic number.

It is not a de Polignac number, because 212164385 - 2¹⁸ = 211902241 is a prime.

It is a Duffinian number.

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, 21216434 + ... + 21216443.

It is an arithmetic number, because the mean of its divisors is an integer number (63649317).

Almost surely, 2^212164385 is an apocalyptic number.

It is an amenable number.

212164385 is a deficient number, since it is larger than the sum of its proper divisors (42432883).

212164385 is an equidigital number, since it uses as much as digits as its factorization.

212164385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42432882.

The product of its digits is 11520, while the sum is 32.

The square root of 212164385 is about 14565.8636887759. The cubic root of 212164385 is about 596.4272728902.

The spelling of 212164385 in words is "two hundred twelve million, one hundred sixty-four thousand, three hundred eighty-five".