133221210 has 16 divisors (see below), whose sum is σ = 319730976. Its totient is φ = 35525648.

The previous prime is 133221173. The next prime is 133221271. The reversal of 133221210 is 12122331.

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 133221210.

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, 2220324 + ... + 2220383.

It is an arithmetic number, because the mean of its divisors is an integer number (19983186).

Almost surely, 2^133221210 is an apocalyptic number.

133221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133221210 is an abundant number, since it is smaller than the sum of its proper divisors (186509766).

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

133221210 is a wasteful number, since it uses less digits than its factorization.

133221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440717.

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

The square root of 133221210 is about 11542.1492799218. The cubic root of 133221210 is about 510.7297128230.

Adding to 133221210 its reverse (12122331), we get a palindrome (145343541).

It can be divided in two parts, 13 and 3221210, that added together give a palindrome (3221223).

The spelling of 133221210 in words is "one hundred thirty-three million, two hundred twenty-one thousand, two hundred ten".