133677721 has 4 divisors (see below), whose sum is σ = 133733632. Its totient is φ = 133621812.

The previous prime is 133677703. The next prime is 133677727. The reversal of 133677721 is 127776331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127776331 = 239 ⋅534629.

It is a cyclic number.

It is not a de Polignac number, because 133677721 - 2⁵ = 133677689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133677727) 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 3 ways as a sum of consecutive naturals, for example, 24201 + ... + 29206.

It is an arithmetic number, because the mean of its divisors is an integer number (33433408).

Almost surely, 2^133677721 is an apocalyptic number.

It is an amenable number.

133677721 is a deficient number, since it is larger than the sum of its proper divisors (55911).

133677721 is an equidigital number, since it uses as much as digits as its factorization.

133677721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55910.

The product of its digits is 37044, while the sum is 37.

The square root of 133677721 is about 11561.9081902599. The cubic root of 133677721 is about 511.3124226401.

The spelling of 133677721 in words is "one hundred thirty-three million, six hundred seventy-seven thousand, seven hundred twenty-one".