4242222121 has 4 divisors (see below), whose sum is σ = 4281141700. Its totient is φ = 4203302544.

The previous prime is 4242222067. The next prime is 4242222191. The reversal of 4242222121 is 1212222424.

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 2117012121 + 2125210000 = 46011^2 + 46100^2 .

It is a cyclic number.

It is not a de Polignac number, because 4242222121 - 2³¹ = 2094738473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4242222092 and 4242222101.

It is not an unprimeable number, because it can be changed into a prime (4242222191) 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, 19459626 + ... + 19459843.

It is an arithmetic number, because the mean of its divisors is an integer number (1070285425).

Almost surely, 2^4242222121 is an apocalyptic number.

It is an amenable number.

4242222121 is a deficient number, since it is larger than the sum of its proper divisors (38919579).

4242222121 is a wasteful number, since it uses less digits than its factorization.

4242222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38919578.

The product of its digits is 1024, while the sum is 22.

The square root of 4242222121 is about 65132.3431253628. The cubic root of 4242222121 is about 1618.8171674877.

Adding to 4242222121 its reverse (1212222424), we get a palindrome (5454444545).

The spelling of 4242222121 in words is "four billion, two hundred forty-two million, two hundred twenty-two thousand, one hundred twenty-one".