133280021 has 8 divisors (see below), whose sum is σ = 152571840. Its totient is φ = 114051168.

The previous prime is 133279981. The next prime is 133280029. The reversal of 133280021 is 120082331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-133280021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133279975 and 133280002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133280029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11111 + ... + 19748.

It is an arithmetic number, because the mean of its divisors is an integer number (19071480).

Almost surely, 2^133280021 is an apocalyptic number.

It is an amenable number.

133280021 is a deficient number, since it is larger than the sum of its proper divisors (19291819).

133280021 is an equidigital number, since it uses as much as digits as its factorization.

133280021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31483.

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

The square root of 133280021 is about 11544.6966612380. The cubic root of 133280021 is about 510.8048562788.

The spelling of 133280021 in words is "one hundred thirty-three million, two hundred eighty thousand, twenty-one".