11220222121 has 4 divisors (see below), whose sum is σ = 11335894612. Its totient is φ = 11104549632.

The previous prime is 11220222103. The next prime is 11220222127. The reversal of 11220222121 is 12122202211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6567481600 + 4652740521 = 81040^2 + 68211^2 .

It is a cyclic number.

It is not a de Polignac number, because 11220222121 - 2¹⁷ = 11220091049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11220222095 and 11220222104.

It is not an unprimeable number, because it can be changed into a prime (11220222127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57836100 + ... + 57836293.

It is an arithmetic number, because the mean of its divisors is an integer number (2833973653).

Almost surely, 2^11220222121 is an apocalyptic number.

It is an amenable number.

11220222121 is a deficient number, since it is larger than the sum of its proper divisors (115672491).

11220222121 is an equidigital number, since it uses as much as digits as its factorization.

11220222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115672490.

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

Adding to 11220222121 its reverse (12122202211), we get a palindrome (23342424332).

The spelling of 11220222121 in words is "eleven billion, two hundred twenty million, two hundred twenty-two thousand, one hundred twenty-one".