133199121 has 16 divisors (see below), whose sum is σ = 194051520. Its totient is φ = 80598720.

The previous prime is 133199111. The next prime is 133199137. The reversal of 133199121 is 121991331.

It is a happy number.

It is not a de Polignac number, because 133199121 - 2⁹ = 133198609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133199111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20551 + ... + 26243.

It is an arithmetic number, because the mean of its divisors is an integer number (12128220).

Almost surely, 2^133199121 is an apocalyptic number.

133199121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133199121 is a deficient number, since it is larger than the sum of its proper divisors (60852399).

133199121 is a wasteful number, since it uses less digits than its factorization.

133199121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6416.

The product of its digits is 1458, while the sum is 30.

The square root of 133199121 is about 11541.1923560783. The cubic root of 133199121 is about 510.7014837540.

The spelling of 133199121 in words is "one hundred thirty-three million, one hundred ninety-nine thousand, one hundred twenty-one".