2121661212 has 48 divisors (see below), whose sum is σ = 5456301312. Its totient is φ = 636295680.

The previous prime is 2121661177. The next prime is 2121661249.

2121661212 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70048 + ... + 95655.

It is an arithmetic number, because the mean of its divisors is an integer number (113672944).

Almost surely, 2^2121661212 is an apocalyptic number.

2121661212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2121661212 is an abundant number, since it is smaller than the sum of its proper divisors (3334640100).

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

2121661212 is a wasteful number, since it uses less digits than its factorization.

2121661212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165818 (or 165816 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 2121661212 is about 46061.4938099059. The cubic root of 2121661212 is about 1284.9671118574.

It can be divided in two parts, 21216 and 61212, that added together give a palindrome (82428).

The spelling of 2121661212 in words is "two billion, one hundred twenty-one million, six hundred sixty-one thousand, two hundred twelve".