212240023 has 4 divisors (see below), whose sum is σ = 212284240. Its totient is φ = 212195808.

The previous prime is 212240003. The next prime is 212240069. The reversal of 212240023 is 320042212.

212240023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212240023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212239979 and 212240006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212240003) 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, 13890 + ... + 24847.

It is an arithmetic number, because the mean of its divisors is an integer number (53071060).

Almost surely, 2^212240023 is an apocalyptic number.

212240023 is a deficient number, since it is larger than the sum of its proper divisors (44217).

212240023 is an equidigital number, since it uses as much as digits as its factorization.

212240023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44216.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 212240023 is about 14568.4598705560. The cubic root of 212240023 is about 596.4981412190.

Adding to 212240023 its reverse (320042212), we get a palindrome (532282235).

The spelling of 212240023 in words is "two hundred twelve million, two hundred forty thousand, twenty-three".