212171345 has 4 divisors (see below), whose sum is σ = 254605620. Its totient is φ = 169737072.

The previous prime is 212171341. The next prime is 212171363. The reversal of 212171345 is 543171212.

212171345 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 40666129 + 171505216 = 6377^2 + 13096^2 .

It is a cyclic number.

It is not a de Polignac number, because 212171345 - 2² = 212171341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212171341) 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, 21217130 + ... + 21217139.

It is an arithmetic number, because the mean of its divisors is an integer number (63651405).

Almost surely, 2^212171345 is an apocalyptic number.

It is an amenable number.

212171345 is a deficient number, since it is larger than the sum of its proper divisors (42434275).

212171345 is an equidigital number, since it uses as much as digits as its factorization.

212171345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42434274.

The product of its digits is 1680, while the sum is 26.

The square root of 212171345 is about 14566.1026015884. The cubic root of 212171345 is about 596.4337947018.

The spelling of 212171345 in words is "two hundred twelve million, one hundred seventy-one thousand, three hundred forty-five".