2113123212 has 72 divisors (see below), whose sum is σ = 5408955552. Its totient is φ = 695520000.

The previous prime is 2113123147. The next prime is 2113123241. The reversal of 2113123212 is 2123213112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2184753 + ... + 2185719.

Almost surely, 2^2113123212 is an apocalyptic number.

It is an amenable number.

2113123212 is an abundant number, since it is smaller than the sum of its proper divisors (3295832340).

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

2113123212 is a wasteful number, since it uses less digits than its factorization.

2113123212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1674 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 2113123212 is about 45968.7199299698. The cubic root of 2113123212 is about 1283.2411374632.

Adding to 2113123212 its reverse (2123213112), we get a palindrome (4236336324).

The spelling of 2113123212 in words is "two billion, one hundred thirteen million, one hundred twenty-three thousand, two hundred twelve".