1233133721 has 2 divisors, whose sum is σ = 1233133722. Its totient is φ = 1233133720.

The previous prime is 1233133711. The next prime is 1233133723. The reversal of 1233133721 is 1273313321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 936054025 + 297079696 = 30595^2 + 17236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1233133721 is a prime.

Together with 1233133723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1233133723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616566860 + 616566861.

It is an arithmetic number, because the mean of its divisors is an integer number (616566861).

Almost surely, 2^1233133721 is an apocalyptic number.

It is an amenable number.

1233133721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1233133721 is an equidigital number, since it uses as much as digits as its factorization.

1233133721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 26.

The square root of 1233133721 is about 35116.0037732086. The cubic root of 1233133721 is about 1072.3504161966.

The spelling of 1233133721 in words is "one billion, two hundred thirty-three million, one hundred thirty-three thousand, seven hundred twenty-one".