212173487 has 4 divisors (see below), whose sum is σ = 212416296. Its totient is φ = 211930680.

The previous prime is 212173477. The next prime is 212173519. The reversal of 212173487 is 784371212.

212173487 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 is a cyclic number.

It is not a de Polignac number, because 212173487 - 2⁴ = 212173471 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 (212173417) 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, 120089 + ... + 121842.

It is an arithmetic number, because the mean of its divisors is an integer number (53104074).

Almost surely, 2^212173487 is an apocalyptic number.

212173487 is a deficient number, since it is larger than the sum of its proper divisors (242809).

212173487 is an equidigital number, since it uses as much as digits as its factorization.

212173487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242808.

The product of its digits is 18816, while the sum is 35.

The square root of 212173487 is about 14566.1761282775. The cubic root of 212173487 is about 596.4358018168.

The spelling of 212173487 in words is "two hundred twelve million, one hundred seventy-three thousand, four hundred eighty-seven".