133723421 has 16 divisors (see below), whose sum is σ = 148505280. Its totient is φ = 119629440.

The previous prime is 133723393. The next prime is 133723451. The reversal of 133723421 is 124327331.

It is not a de Polignac number, because 133723421 - 2²² = 129529117 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 (133723451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76841 + ... + 78561.

It is an arithmetic number, because the mean of its divisors is an integer number (9281580).

Almost surely, 2^133723421 is an apocalyptic number.

It is an amenable number.

133723421 is a deficient number, since it is larger than the sum of its proper divisors (14781859).

133723421 is a wasteful number, since it uses less digits than its factorization.

133723421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916.

The product of its digits is 3024, while the sum is 26.

The square root of 133723421 is about 11563.8843387505. The cubic root of 133723421 is about 511.3706829476.

The spelling of 133723421 in words is "one hundred thirty-three million, seven hundred twenty-three thousand, four hundred twenty-one".