133521443 has 6 divisors (see below), whose sum is σ = 146763372. Its totient is φ = 121383020.

The previous prime is 133521439. The next prime is 133521499. The reversal of 133521443 is 344125331.

It is not a de Polignac number, because 133521443 - 2² = 133521439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133526443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 551621 + ... + 551862.

It is an arithmetic number, because the mean of its divisors is an integer number (24460562).

Almost surely, 2^133521443 is an apocalyptic number.

133521443 is a deficient number, since it is larger than the sum of its proper divisors (13241929).

133521443 is a wasteful number, since it uses less digits than its factorization.

133521443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103505 (or 1103494 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 133521443 is about 11555.1479003949. The cubic root of 133521443 is about 511.1130923871.

Adding to 133521443 its reverse (344125331), we get a palindrome (477646774).

The spelling of 133521443 in words is "one hundred thirty-three million, five hundred twenty-one thousand, four hundred forty-three".