133021541 has 4 divisors (see below), whose sum is σ = 135202284. Its totient is φ = 130840800.

The previous prime is 133021531. The next prime is 133021561. The reversal of 133021541 is 145120331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145120331 = 31 ⋅4681301.

It can be written as a sum of positive squares in 2 ways, for example, as 32821441 + 100200100 = 5729^2 + 10010^2 .

It is a cyclic number.

It is not a de Polignac number, because 133021541 - 2¹⁴ = 133005157 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 (133021501) 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, 1090280 + ... + 1090401.

It is an arithmetic number, because the mean of its divisors is an integer number (33800571).

Almost surely, 2^133021541 is an apocalyptic number.

It is an amenable number.

133021541 is a deficient number, since it is larger than the sum of its proper divisors (2180743).

133021541 is an equidigital number, since it uses as much as digits as its factorization.

133021541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180742.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 133021541 is about 11533.4964776515. The cubic root of 133021541 is about 510.4744284470.

Adding to 133021541 its reverse (145120331), we get a palindrome (278141872).

The spelling of 133021541 in words is "one hundred thirty-three million, twenty-one thousand, five hundred forty-one".