1331202121 has 2 divisors, whose sum is σ = 1331202122. Its totient is φ = 1331202120.

The previous prime is 1331202107. The next prime is 1331202133. The reversal of 1331202121 is 1212021331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 850014025 + 481188096 = 29155^2 + 21936^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331202121 - 2¹⁹ = 1330677833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1331202095 and 1331202104.

It is not a weakly prime, because it can be changed into another prime (1331202161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665601060 + 665601061.

It is an arithmetic number, because the mean of its divisors is an integer number (665601061).

Almost surely, 2^1331202121 is an apocalyptic number.

It is an amenable number.

1331202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331202121 is an equidigital number, since it uses as much as digits as its factorization.

1331202121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1331202121 is about 36485.6426694118. The cubic root of 1331202121 is about 1100.0556778980.

Adding to 1331202121 its reverse (1212021331), we get a palindrome (2543223452).

The spelling of 1331202121 in words is "one billion, three hundred thirty-one million, two hundred two thousand, one hundred twenty-one".