133221043 has 4 divisors (see below), whose sum is σ = 137518528. Its totient is φ = 128923560.

The previous prime is 133221031. The next prime is 133221047. The reversal of 133221043 is 340122331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133221043 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 133221043.

It is not an unprimeable number, because it can be changed into a prime (133221047) 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, 2148696 + ... + 2148757.

It is an arithmetic number, because the mean of its divisors is an integer number (34379632).

Almost surely, 2^133221043 is an apocalyptic number.

133221043 is a deficient number, since it is larger than the sum of its proper divisors (4297485).

133221043 is an equidigital number, since it uses as much as digits as its factorization.

133221043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4297484.

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

The square root of 133221043 is about 11542.1420455650. The cubic root of 133221043 is about 510.7294994138.

Adding to 133221043 its reverse (340122331), we get a palindrome (473343374).

It can be divided in two parts, 13322 and 1043, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 133221043 in words is "one hundred thirty-three million, two hundred twenty-one thousand, forty-three".