2212212121 has 16 divisors (see below), whose sum is σ = 2591331840. Its totient is φ = 1849155840.

The previous prime is 2212212109. The next prime is 2212212131. The reversal of 2212212121 is 1212122122.

It is a happy number.

It is not a de Polignac number, because 2212212121 - 2¹¹ = 2212210073 is a prime.

2212212121 is a modest number, since divided by 212121 gives 2212 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 2212212095 and 2212212104.

It is not an unprimeable number, because it can be changed into a prime (2212212131) 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, 80485 + ... + 104413.

It is an arithmetic number, because the mean of its divisors is an integer number (161958240).

Almost surely, 2^2212212121 is an apocalyptic number.

It is an amenable number.

2212212121 is a deficient number, since it is larger than the sum of its proper divisors (379119719).

2212212121 is a wasteful number, since it uses less digits than its factorization.

2212212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24264.

The product of its digits is 64, while the sum is 16.

The square root of 2212212121 is about 47034.1590867744. The cubic root of 2212212121 is about 1302.9935198513.

Adding to 2212212121 its reverse (1212122122), we get a palindrome (3424334243).

It can be divided in two parts, 22122 and 12121, that added together give a palindrome (34243).

The spelling of 2212212121 in words is "two billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-one".