212409023 has 4 divisors (see below), whose sum is σ = 212460888. Its totient is φ = 212357160.

The previous prime is 212409013. The next prime is 212409031. The reversal of 212409023 is 320904212.

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 212409023 - 2⁴ = 212409007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212409023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212409013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19208 + ... + 28173.

It is an arithmetic number, because the mean of its divisors is an integer number (53115222).

Almost surely, 2^212409023 is an apocalyptic number.

212409023 is a deficient number, since it is larger than the sum of its proper divisors (51865).

212409023 is an equidigital number, since it uses as much as digits as its factorization.

212409023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51864.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 212409023 is about 14574.2589176946. The cubic root of 212409023 is about 596.6564233995.

The spelling of 212409023 in words is "two hundred twelve million, four hundred nine thousand, twenty-three".