133051221 has 8 divisors (see below), whose sum is σ = 197112960. Its totient is φ = 88700796.

The previous prime is 133051211. The next prime is 133051229. The reversal of 133051221 is 122150331.

133051221 is a `hidden beast` number, since 133 + 0 + 512 + 21 = 666.

It is not a de Polignac number, because 133051221 - 2¹¹ = 133049173 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 133051194 and 133051203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133051229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2463885 + ... + 2463938.

It is an arithmetic number, because the mean of its divisors is an integer number (24639120).

Almost surely, 2^133051221 is an apocalyptic number.

It is an amenable number.

133051221 is a deficient number, since it is larger than the sum of its proper divisors (64061739).

133051221 is an equidigital number, since it uses as much as digits as its factorization.

133051221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4927832 (or 4927826 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 133051221 is about 11534.7830928891. The cubic root of 133051221 is about 510.5123916076.

The spelling of 133051221 in words is "one hundred thirty-three million, fifty-one thousand, two hundred twenty-one".