4331212121 has 2 divisors, whose sum is σ = 4331212122. Its totient is φ = 4331212120.

The previous prime is 4331212117. The next prime is 4331212139. The reversal of 4331212121 is 1212121334.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2731212121 + 1600000000 = 52261^2 + 40000^2 .

It is a cyclic number.

It is not a de Polignac number, because 4331212121 - 2² = 4331212117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4331212093 and 4331212102.

It is not a weakly prime, because it can be changed into another prime (4331212021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2165606060 + 2165606061.

It is an arithmetic number, because the mean of its divisors is an integer number (2165606061).

Almost surely, 2^4331212121 is an apocalyptic number.

It is an amenable number.

4331212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4331212121 is an equidigital number, since it uses as much as digits as its factorization.

4331212121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 20.

The square root of 4331212121 is about 65811.9451239667. The cubic root of 4331212121 is about 1630.0583517570.

Adding to 4331212121 its reverse (1212121334), we get a palindrome (5543333455).

The spelling of 4331212121 in words is "four billion, three hundred thirty-one million, two hundred twelve thousand, one hundred twenty-one".