4002222121 has 2 divisors, whose sum is σ = 4002222122. Its totient is φ = 4002222120.

The previous prime is 4002222101. The next prime is 4002222137. The reversal of 4002222121 is 1212222004.

It is an a-pointer prime, because the next prime (4002222137) can be obtained adding 4002222121 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3473452096 + 528770025 = 58936^2 + 22995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4002222121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4002222095 and 4002222104.

It is not a weakly prime, because it can be changed into another prime (4002222101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2001111060 + 2001111061.

It is an arithmetic number, because the mean of its divisors is an integer number (2001111061).

Almost surely, 2^4002222121 is an apocalyptic number.

It is an amenable number.

4002222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4002222121 is an equidigital number, since it uses as much as digits as its factorization.

4002222121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 4002222121 is about 63263.1181732295. The cubic root of 4002222121 is about 1587.6949473201.

Adding to 4002222121 its reverse (1212222004), we get a palindrome (5214444125).

The spelling of 4002222121 in words is "four billion, two million, two hundred twenty-two thousand, one hundred twenty-one".