133401221 has 4 divisors (see below), whose sum is σ = 135392352. Its totient is φ = 131410092.

The previous prime is 133401211. The next prime is 133401239. The reversal of 133401221 is 122104331.

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.

It is a cyclic number.

It is not a de Polignac number, because 133401221 - 2¹⁴ = 133384837 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 133401221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133401211) 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, 995465 + ... + 995598.

It is an arithmetic number, because the mean of its divisors is an integer number (33848088).

Almost surely, 2^133401221 is an apocalyptic number.

It is an amenable number.

133401221 is a deficient number, since it is larger than the sum of its proper divisors (1991131).

133401221 is an equidigital number, since it uses as much as digits as its factorization.

133401221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991130.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 133401221 is about 11549.9446319019. The cubic root of 133401221 is about 510.9596451499.

Adding to 133401221 its reverse (122104331), we get a palindrome (255505552).

The spelling of 133401221 in words is "one hundred thirty-three million, four hundred one thousand, two hundred twenty-one".