133221220 has 24 divisors (see below), whose sum is σ = 305198208. Its totient is φ = 48444000.

The previous prime is 133221173. The next prime is 133221271. The reversal of 133221220 is 22122331.

It is a junction number, because it is equal to n+sod(n) for n = 133221194 and 133221203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302556 + ... + 302995.

It is an arithmetic number, because the mean of its divisors is an integer number (12716592).

Almost surely, 2^133221220 is an apocalyptic number.

133221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133221220 is an abundant number, since it is smaller than the sum of its proper divisors (171976988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133221220 is a wasteful number, since it uses less digits than its factorization.

133221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605571 (or 605569 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 133221220 is about 11542.1497131167. The cubic root of 133221220 is about 510.7297256020.

Adding to 133221220 its reverse (22122331), we get a palindrome (155343551).

The spelling of 133221220 in words is "one hundred thirty-three million, two hundred twenty-one thousand, two hundred twenty".