133143021 has 80 divisors (see below), whose sum is σ = 232087680. Its totient is φ = 75271680.

The previous prime is 133143019. The next prime is 133143037. The reversal of 133143021 is 120341331.

It is not a de Polignac number, because 133143021 - 2¹ = 133143019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 133142985 and 133143003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133143011) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1495945 + ... + 1496033.

It is an arithmetic number, because the mean of its divisors is an integer number (2901096).

Almost surely, 2^133143021 is an apocalyptic number.

133143021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133143021 is a deficient number, since it is larger than the sum of its proper divisors (98944659).

133143021 is a wasteful number, since it uses less digits than its factorization.

133143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 133143021 is about 11538.7616753272. The cubic root of 133143021 is about 510.6297756320.

Adding to 133143021 its reverse (120341331), we get a palindrome (253484352).

The spelling of 133143021 in words is "one hundred thirty-three million, one hundred forty-three thousand, twenty-one".