133292821 has 4 divisors (see below), whose sum is σ = 133317100. Its totient is φ = 133268544.

The previous prime is 133292813. The next prime is 133292837. The reversal of 133292821 is 128292331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128292331 = 401 ⋅319931.

It can be written as a sum of positive squares in 2 ways, for example, as 74218225 + 59074596 = 8615^2 + 7686^2 .

It is a cyclic number.

It is not a de Polignac number, because 133292821 - 2³ = 133292813 is a prime.

It is a super-2 number, since 2×133292821² = 35533952260276082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133292851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445 + ... + 16333.

It is an arithmetic number, because the mean of its divisors is an integer number (33329275).

Almost surely, 2^133292821 is an apocalyptic number.

It is an amenable number.

133292821 is a deficient number, since it is larger than the sum of its proper divisors (24279).

133292821 is an equidigital number, since it uses as much as digits as its factorization.

133292821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24278.

The product of its digits is 5184, while the sum is 31.

The square root of 133292821 is about 11545.2510150278. The cubic root of 133292821 is about 510.8212080491.

The spelling of 133292821 in words is "one hundred thirty-three million, two hundred ninety-two thousand, eight hundred twenty-one".