212940823 has 4 divisors (see below), whose sum is σ = 220283640. Its totient is φ = 205598008.

The previous prime is 212940821. The next prime is 212940869. The reversal of 212940823 is 328049212.

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 212940823 - 2¹ = 212940821 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 (212940821) 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, 3671365 + ... + 3671422.

It is an arithmetic number, because the mean of its divisors is an integer number (55070910).

Almost surely, 2^212940823 is an apocalyptic number.

212940823 is a deficient number, since it is larger than the sum of its proper divisors (7342817).

212940823 is an equidigital number, since it uses as much as digits as its factorization.

212940823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7342816.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 212940823 is about 14592.4920078786. The cubic root of 212940823 is about 597.1539500485.

The spelling of 212940823 in words is "two hundred twelve million, nine hundred forty thousand, eight hundred twenty-three".