212146399 has 4 divisors (see below), whose sum is σ = 212311264. Its totient is φ = 211981536.

The previous prime is 212146379. The next prime is 212146409. The reversal of 212146399 is 993641212.

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 212146399 - 2¹⁵ = 212113631 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 (212146309) 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, 80487 + ... + 83080.

It is an arithmetic number, because the mean of its divisors is an integer number (53077816).

Almost surely, 2^212146399 is an apocalyptic number.

212146399 is a deficient number, since it is larger than the sum of its proper divisors (164865).

212146399 is a wasteful number, since it uses less digits than its factorization.

212146399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164864.

The product of its digits is 23328, while the sum is 37.

The square root of 212146399 is about 14565.2462732355. The cubic root of 212146399 is about 596.4104185942.

It can be divided in two parts, 212 and 146399, that added together give a triangular number (146611 = T₅₄₁).

The spelling of 212146399 in words is "two hundred twelve million, one hundred forty-six thousand, three hundred ninety-nine".