213212123 has 4 divisors (see below), whose sum is σ = 214570320. Its totient is φ = 211853928.

The previous prime is 213212117. The next prime is 213212137. The reversal of 213212123 is 321212312.

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 213212123 - 2⁶ = 213212059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213214123) 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, 678863 + ... + 679176.

It is an arithmetic number, because the mean of its divisors is an integer number (53642580).

Almost surely, 2^213212123 is an apocalyptic number.

213212123 is a deficient number, since it is larger than the sum of its proper divisors (1358197).

213212123 is a wasteful number, since it uses less digits than its factorization.

213212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358196.

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

The square root of 213212123 is about 14601.7849251384. The cubic root of 213212123 is about 597.4074463177.

Adding to 213212123 its reverse (321212312), we get a palindrome (534424435).

The spelling of 213212123 in words is "two hundred thirteen million, two hundred twelve thousand, one hundred twenty-three".