133321720 has 64 divisors (see below), whose sum is σ = 344710080. Its totient is φ = 45459456.

The previous prime is 133321697. The next prime is 133321723. The reversal of 133321720 is 27123331.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 133321691 and 133321700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133321723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53952 + ... + 56368.

It is an arithmetic number, because the mean of its divisors is an integer number (5386095).

Almost surely, 2^133321720 is an apocalyptic number.

133321720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133321720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172355040).

133321720 is an abundant number, since it is smaller than the sum of its proper divisors (211388360).

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

133321720 is a wasteful number, since it uses less digits than its factorization.

133321720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632 (or 2628 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 133321720 is about 11546.5025007575. The cubic root of 133321720 is about 510.8581221536.

The spelling of 133321720 in words is "one hundred thirty-three million, three hundred twenty-one thousand, seven hundred twenty".