133434821 has 4 divisors (see below), whose sum is σ = 143699052. Its totient is φ = 123170592.

The previous prime is 133434811. The next prime is 133434823. The reversal of 133434821 is 128434331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128434331 = 113 ⋅1136587.

It can be written as a sum of positive squares in 2 ways, for example, as 75446596 + 57988225 = 8686^2 + 7615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133434821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133434823) 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, 5132096 + ... + 5132121.

It is an arithmetic number, because the mean of its divisors is an integer number (35924763).

Almost surely, 2^133434821 is an apocalyptic number.

It is an amenable number.

133434821 is a deficient number, since it is larger than the sum of its proper divisors (10264231).

133434821 is a wasteful number, since it uses less digits than its factorization.

133434821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10264230.

The product of its digits is 6912, while the sum is 29.

The square root of 133434821 is about 11551.3990927506. The cubic root of 133434821 is about 511.0025403167.

The spelling of 133434821 in words is "one hundred thirty-three million, four hundred thirty-four thousand, eight hundred twenty-one".