212310309 has 16 divisors (see below), whose sum is σ = 298108800. Its totient is φ = 134139456.

The previous prime is 212310283. The next prime is 212310347. The reversal of 212310309 is 903013212.

It is a happy number.

212310309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212310309 - 2⁵ = 212310277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212310409) 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, 6594 + ... + 21635.

It is an arithmetic number, because the mean of its divisors is an integer number (18631800).

Almost surely, 2^212310309 is an apocalyptic number.

It is an amenable number.

212310309 is a deficient number, since it is larger than the sum of its proper divisors (85798491).

212310309 is a wasteful number, since it uses less digits than its factorization.

212310309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28364.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 212310309 is about 14570.8719368472. The cubic root of 212310309 is about 596.5639799497.

The spelling of 212310309 in words is "two hundred twelve million, three hundred ten thousand, three hundred nine".