2221122121 has 8 divisors (see below), whose sum is σ = 2318831424. Its totient is φ = 2123507760.

The previous prime is 2221122119. The next prime is 2221122139. The reversal of 2221122121 is 1212211222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2221122121 - 2¹ = 2221122119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221122095 and 2221122104.

It is not an unprimeable number, because it can be changed into a prime (2221122821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26355 + ... + 71671.

It is an arithmetic number, because the mean of its divisors is an integer number (289853928).

Almost surely, 2^2221122121 is an apocalyptic number.

It is an amenable number.

2221122121 is a deficient number, since it is larger than the sum of its proper divisors (97709303).

2221122121 is a wasteful number, since it uses less digits than its factorization.

2221122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47471.

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

The square root of 2221122121 is about 47128.7822991428. The cubic root of 2221122121 is about 1304.7405073120.

Adding to 2221122121 its reverse (1212211222), we get a palindrome (3433333343).

The spelling of 2221122121 in words is "two billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".