212099387 has 4 divisors (see below), whose sum is σ = 212200776. Its totient is φ = 211998000.

The previous prime is 212099369. The next prime is 212099389. The reversal of 212099387 is 783990212.

It is a happy number.

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 212099387 - 2⁸ = 212099131 is a prime.

It is a super-3 number, since 3×212099387³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212099389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47489 + ... + 51762.

It is an arithmetic number, because the mean of its divisors is an integer number (53050194).

Almost surely, 2^212099387 is an apocalyptic number.

212099387 is a deficient number, since it is larger than the sum of its proper divisors (101389).

212099387 is an equidigital number, since it uses as much as digits as its factorization.

212099387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101388.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 212099387 is about 14563.6323422421. The cubic root of 212099387 is about 596.3663601545.

The spelling of 212099387 in words is "two hundred twelve million, ninety-nine thousand, three hundred eighty-seven".