212121323 has 4 divisors (see below), whose sum is σ = 212196960. Its totient is φ = 212045688.

The previous prime is 212121319. The next prime is 212121379. The reversal of 212121323 is 323121212.

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 212121323 - 2² = 212121319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212121383) 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, 33443 + ... + 39276.

It is an arithmetic number, because the mean of its divisors is an integer number (53049240).

Almost surely, 2^212121323 is an apocalyptic number.

212121323 is a deficient number, since it is larger than the sum of its proper divisors (75637).

212121323 is an equidigital number, since it uses as much as digits as its factorization.

212121323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75636.

The product of its digits is 144, while the sum is 17.

The square root of 212121323 is about 14564.3854315931. The cubic root of 212121323 is about 596.3869188207.

Adding to 212121323 its reverse (323121212), we get a palindrome (535242535).

The spelling of 212121323 in words is "two hundred twelve million, one hundred twenty-one thousand, three hundred twenty-three".