133213321 has 4 divisors (see below), whose sum is σ = 133236432. Its totient is φ = 133190212.

The previous prime is 133213277. The next prime is 133213337. The reversal of 133213321 is 123312331.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 133213321 - 2¹³ = 133205129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133213391) 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, 4950 + ... + 17056.

It is an arithmetic number, because the mean of its divisors is an integer number (33309108).

Almost surely, 2^133213321 is an apocalyptic number.

It is an amenable number.

133213321 is a deficient number, since it is larger than the sum of its proper divisors (23111).

133213321 is a wasteful number, since it uses less digits than its factorization.

133213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23110.

The product of its digits is 324, while the sum is 19.

The square root of 133213321 is about 11541.8075274196. The cubic root of 133213321 is about 510.7196312796.

Adding to 133213321 its reverse (123312331), we get a palindrome (256525652).

The spelling of 133213321 in words is "one hundred thirty-three million, two hundred thirteen thousand, three hundred twenty-one".