133221100 has 36 divisors (see below), whose sum is σ = 289651600. Its totient is φ = 53184960.

The previous prime is 133221091. The next prime is 133221107. The reversal of 133221100 is 1122331.

It is a super-2 number, since 2×133221100² = 35495722970420000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133221107) 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, 69961 + ... + 71839.

Almost surely, 2^133221100 is an apocalyptic number.

133221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133221100 is an abundant number, since it is smaller than the sum of its proper divisors (156430500).

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

133221100 is a wasteful number, since it uses less digits than its factorization.

133221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2602 (or 2595 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 133221100 is about 11542.1445147771. The cubic root of 133221100 is about 510.7295722541.

Adding to 133221100 its reverse (1122331), we get a palindrome (134343431).

The spelling of 133221100 in words is "one hundred thirty-three million, two hundred twenty-one thousand, one hundred".