2121215442 has 32 divisors (see below), whose sum is σ = 4574646720. Its totient is φ = 653518080.

The previous prime is 2121215441. The next prime is 2121215489. The reversal of 2121215442 is 2445121212.

It is not an unprimeable number, because it can be changed into a prime (2121215441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222243 + ... + 231590.

It is an arithmetic number, because the mean of its divisors is an integer number (142957710).

Almost surely, 2^2121215442 is an apocalyptic number.

2121215442 is an abundant number, since it is smaller than the sum of its proper divisors (2453431278).

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

2121215442 is a wasteful number, since it uses less digits than its factorization.

2121215442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453898.

The product of its digits is 1280, while the sum is 24.

The square root of 2121215442 is about 46056.6546983169. The cubic root of 2121215442 is about 1284.8771132113.

Adding to 2121215442 its reverse (2445121212), we get a palindrome (4566336654).

The spelling of 2121215442 in words is "two billion, one hundred twenty-one million, two hundred fifteen thousand, four hundred forty-two".