133521420 has 48 divisors (see below), whose sum is σ = 382985568. Its totient is φ = 34736640.

The previous prime is 133521397. The next prime is 133521431. The reversal of 133521420 is 24125331.

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 15 ways as a sum of consecutive naturals, for example, 24679 + ... + 29598.

It is an arithmetic number, because the mean of its divisors is an integer number (7978866).

Almost surely, 2^133521420 is an apocalyptic number.

133521420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133521420 is an abundant number, since it is smaller than the sum of its proper divisors (249464148).

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

133521420 is a wasteful number, since it uses less digits than its factorization.

133521420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54330 (or 54328 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 133521420 is about 11555.1469051674. The cubic root of 133521420 is about 511.1130630395.

Adding to 133521420 its reverse (24125331), we get a palindrome (157646751).

The spelling of 133521420 in words is "one hundred thirty-three million, five hundred twenty-one thousand, four hundred twenty".