133234021 has 4 divisors (see below), whose sum is σ = 133314412. Its totient is φ = 133153632.

The previous prime is 133234019. The next prime is 133234037. The reversal of 133234021 is 120432331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120432331 = 29 ⋅4152839.

It can be written as a sum of positive squares in 2 ways, for example, as 22752900 + 110481121 = 4770^2 + 10511^2 .

It is a cyclic number.

It is not a de Polignac number, because 133234021 - 2¹ = 133234019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133234021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133234121) 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, 37656 + ... + 41041.

It is an arithmetic number, because the mean of its divisors is an integer number (33328603).

Almost surely, 2^133234021 is an apocalyptic number.

It is an amenable number.

133234021 is a deficient number, since it is larger than the sum of its proper divisors (80391).

133234021 is an equidigital number, since it uses as much as digits as its factorization.

133234021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80390.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 133234021 is about 11542.7042325445. The cubic root of 133234021 is about 510.7460834611.

Adding to 133234021 its reverse (120432331), we get a palindrome (253666352).

It can be divided in two parts, 1332 and 34021, that added together give a palindrome (35353).

The spelling of 133234021 in words is "one hundred thirty-three million, two hundred thirty-four thousand, twenty-one".