212120423 has 4 divisors (see below), whose sum is σ = 213544200. Its totient is φ = 210696648.

The previous prime is 212120411. The next prime is 212120443. The reversal of 212120423 is 324021212.

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 212120423 - 2¹⁰ = 212119399 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 (212120443) 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, 711665 + ... + 711962.

It is an arithmetic number, because the mean of its divisors is an integer number (53386050).

Almost surely, 2^212120423 is an apocalyptic number.

212120423 is a deficient number, since it is larger than the sum of its proper divisors (1423777).

212120423 is a wasteful number, since it uses less digits than its factorization.

212120423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423776.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 212120423 is about 14564.3545342731. The cubic root of 212120423 is about 596.3860753584.

Adding to 212120423 its reverse (324021212), we get a palindrome (536141635).

The spelling of 212120423 in words is "two hundred twelve million, one hundred twenty thousand, four hundred twenty-three".