213123012 has 12 divisors (see below), whose sum is σ = 497287056. Its totient is φ = 71041000.

The previous prime is 213122971. The next prime is 213123041. The reversal of 213123012 is 210321312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 213122982 and 213123000.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8880114 + ... + 8880137.

It is an arithmetic number, because the mean of its divisors is an integer number (41440588).

Almost surely, 2^213123012 is an apocalyptic number.

It is an amenable number.

213123012 is an abundant number, since it is smaller than the sum of its proper divisors (284164044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213123012 is a wasteful number, since it uses less digits than its factorization.

213123012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17760258 (or 17760256 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 213123012 is about 14598.7332327158. The cubic root of 213123012 is about 597.3242068464.

Adding to 213123012 its reverse (210321312), we get a palindrome (423444324).

The spelling of 213123012 in words is "two hundred thirteen million, one hundred twenty-three thousand, twelve".