133221351 has 12 divisors (see below), whose sum is σ = 180704312. Its totient is φ = 87302064.

The previous prime is 133221343. The next prime is 133221371. The reversal of 133221351 is 153122331.

It is not a de Polignac number, because 133221351 - 2³ = 133221343 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 (133221301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4065 + ... + 16821.

Almost surely, 2^133221351 is an apocalyptic number.

133221351 is a deficient number, since it is larger than the sum of its proper divisors (47482961).

133221351 is an equidigital number, since it uses as much as digits as its factorization.

133221351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12878 (or 12819 counting only the distinct ones).

The product of its digits is 540, while the sum is 21.

The square root of 133221351 is about 11542.1553879681. The cubic root of 133221351 is about 510.7298930067.

Adding to 133221351 its reverse (153122331), we get a palindrome (286343682).

The spelling of 133221351 in words is "one hundred thirty-three million, two hundred twenty-one thousand, three hundred fifty-one".