212001999 has 16 divisors (see below), whose sum is σ = 308720640. Its totient is φ = 128338560.

The previous prime is 212001983. The next prime is 212002027. The reversal of 212001999 is 999100212.

It is not a de Polignac number, because 212001999 - 2⁴ = 212001983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212001949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30114 + ... + 36480.

It is an arithmetic number, because the mean of its divisors is an integer number (19295040).

Almost surely, 2^212001999 is an apocalyptic number.

212001999 is a deficient number, since it is larger than the sum of its proper divisors (96718641).

212001999 is a wasteful number, since it uses less digits than its factorization.

212001999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7390.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 212001999 is about 14560.2884243411. The cubic root of 212001999 is about 596.2750699039.

The spelling of 212001999 in words is "two hundred twelve million, one thousand, nine hundred ninety-nine".