133011721 has 2 divisors, whose sum is σ = 133011722. Its totient is φ = 133011720.

The previous prime is 133011701. The next prime is 133011727. The reversal of 133011721 is 127110331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130416400 + 2595321 = 11420^2 + 1611^2 .

It is a cyclic number.

It is not a de Polignac number, because 133011721 - 2⁹ = 133011209 is a prime.

It is not a weakly prime, because it can be changed into another prime (133011727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66505860 + 66505861.

It is an arithmetic number, because the mean of its divisors is an integer number (66505861).

Almost surely, 2^133011721 is an apocalyptic number.

It is an amenable number.

133011721 is a deficient number, since it is larger than the sum of its proper divisors (1).

133011721 is an equidigital number, since it uses as much as digits as its factorization.

133011721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 133011721 is about 11533.0707532730. The cubic root of 133011721 is about 510.4618666163.

The spelling of 133011721 in words is "one hundred thirty-three million, eleven thousand, seven hundred twenty-one".