133312021 has 8 divisors (see below), whose sum is σ = 135094104. Its totient is φ = 131539200.

The previous prime is 133311991. The next prime is 133312051. The reversal of 133312021 is 120213331.

It is an interprime number because it is at equal distance from previous prime (133311991) and next prime (133312051).

It can be written as a sum of positive squares in 4 ways, for example, as 37075921 + 96236100 = 6089^2 + 9810^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 133312021 - 2⁵ = 133311989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133311986 and 133312004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133312051) 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, 29505 + ... + 33721.

It is an arithmetic number, because the mean of its divisors is an integer number (16886763).

Almost surely, 2^133312021 is an apocalyptic number.

It is an amenable number.

133312021 is a deficient number, since it is larger than the sum of its proper divisors (1782083).

133312021 is a wasteful number, since it uses less digits than its factorization.

133312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4631.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 133312021 is about 11546.0824958078. The cubic root of 133312021 is about 510.8457337419.

Adding to 133312021 its reverse (120213331), we get a palindrome (253525352).

The spelling of 133312021 in words is "one hundred thirty-three million, three hundred twelve thousand, twenty-one".