133404421 has 4 divisors (see below), whose sum is σ = 134141644. Its totient is φ = 132667200.

The previous prime is 133404409. The next prime is 133404431. The reversal of 133404421 is 124404331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5827396 + 127577025 = 2414^2 + 11295^2 .

It is a cyclic number.

It is not a de Polignac number, because 133404421 - 2⁹ = 133403909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133404392 and 133404401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133404431) 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, 368340 + ... + 368701.

It is an arithmetic number, because the mean of its divisors is an integer number (33535411).

Almost surely, 2^133404421 is an apocalyptic number.

It is an amenable number.

133404421 is a deficient number, since it is larger than the sum of its proper divisors (737223).

133404421 is an equidigital number, since it uses as much as digits as its factorization.

133404421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737222.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 133404421 is about 11550.0831598738. The cubic root of 133404421 is about 510.9637307142.

Adding to 133404421 its reverse (124404331), we get a palindrome (257808752).

The spelling of 133404421 in words is "one hundred thirty-three million, four hundred four thousand, four hundred twenty-one".