133530221 has 8 divisors (see below), whose sum is σ = 145753344. Its totient is φ = 121321120.

The previous prime is 133530209. The next prime is 133530247. The reversal of 133530221 is 122035331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133530221 - 2²² = 129335917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 133530193 and 133530202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133530251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32921 + ... + 36753.

It is an arithmetic number, because the mean of its divisors is an integer number (18219168).

Almost surely, 2^133530221 is an apocalyptic number.

133530221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133530221 is a deficient number, since it is larger than the sum of its proper divisors (12223123).

133530221 is a wasteful number, since it uses less digits than its factorization.

133530221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7011.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 133530221 is about 11555.5277248596. The cubic root of 133530221 is about 511.1242927165.

Adding to 133530221 its reverse (122035331), we get a palindrome (255565552).

The spelling of 133530221 in words is "one hundred thirty-three million, five hundred thirty thousand, two hundred twenty-one".