212121200309 has 8 divisors (see below), whose sum is σ = 221351114880. Its totient is φ = 202891890256.

The previous prime is 212121200303. The next prime is 212121200383. The reversal of 212121200309 is 903002121212.

It is a happy number.

212121200309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212121200309 - 2⁴ = 212121200293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121200303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 658199 + ... + 925995.

It is an arithmetic number, because the mean of its divisors is an integer number (27668889360).

Almost surely, 2^212121200309 is an apocalyptic number.

It is an amenable number.

212121200309 is a deficient number, since it is larger than the sum of its proper divisors (9229914571).

212121200309 is a wasteful number, since it uses less digits than its factorization.

212121200309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302259.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 212121200309 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred thousand, three hundred nine".