212121199 has 8 divisors (see below), whose sum is σ = 217002240. Its totient is φ = 207255576.

The previous prime is 212121197. The next prime is 212121209. The reversal of 212121199 is 991121212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212121199 - 2¹ = 212121197 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 (212121197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26712 + ... + 33730.

It is an arithmetic number, because the mean of its divisors is an integer number (27125280).

Almost surely, 2^212121199 is an apocalyptic number.

212121199 is a deficient number, since it is larger than the sum of its proper divisors (4881041).

212121199 is an equidigital number, since it uses as much as digits as its factorization.

212121199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7709.

The product of its digits is 648, while the sum is 28.

The square root of 212121199 is about 14564.3811746329. The cubic root of 212121199 is about 596.3868026105.

The spelling of 212121199 in words is "two hundred twelve million, one hundred twenty-one thousand, one hundred ninety-nine".