133211220 has 24 divisors (see below), whose sum is σ = 372991584. Its totient is φ = 35522976.

The previous prime is 133211219. The next prime is 133211233. The reversal of 133211220 is 22112331.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 133211220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110034 + ... + 1110153.

It is an arithmetic number, because the mean of its divisors is an integer number (15541316).

Almost surely, 2^133211220 is an apocalyptic number.

133211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133211220 is an abundant number, since it is smaller than the sum of its proper divisors (239780364).

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

133211220 is a wasteful number, since it uses less digits than its factorization.

133211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220199 (or 2220197 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 133211220 is about 11541.7165101210. The cubic root of 133211220 is about 510.7169462939.

Adding to 133211220 its reverse (22112331), we get a palindrome (155323551).

It can be divided in two parts, 13321 and 1220, that added together give a palindrome (14541).

The spelling of 133211220 in words is "one hundred thirty-three million, two hundred eleven thousand, two hundred twenty".