12220212121 has 16 divisors (see below), whose sum is σ = 14299747840. Its totient is φ = 10341768960.

The previous prime is 12220212089. The next prime is 12220212127. The reversal of 12220212121 is 12121202221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12220212121 - 2⁵ = 12220212089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12220212095 and 12220212104.

It is not an unprimeable number, because it can be changed into a prime (12220212127) 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, 790320 + ... + 805633.

It is an arithmetic number, because the mean of its divisors is an integer number (893734240).

Almost surely, 2^12220212121 is an apocalyptic number.

It is an amenable number.

12220212121 is a deficient number, since it is larger than the sum of its proper divisors (2079535719).

12220212121 is a wasteful number, since it uses less digits than its factorization.

12220212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596016.

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

Adding to 12220212121 its reverse (12121202221), we get a palindrome (24341414342).

The spelling of 12220212121 in words is "twelve billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-one".