133158921 has 12 divisors (see below), whose sum is σ = 206532432. Its totient is φ = 76090728.

The previous prime is 133158899. The next prime is 133158941. The reversal of 133158921 is 129851331.

It is not a de Polignac number, because 133158921 - 2⁵ = 133158889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133158941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 452775 + ... + 453068.

It is an arithmetic number, because the mean of its divisors is an integer number (17211036).

Almost surely, 2^133158921 is an apocalyptic number.

It is an amenable number.

133158921 is a deficient number, since it is larger than the sum of its proper divisors (73373511).

133158921 is an equidigital number, since it uses as much as digits as its factorization.

133158921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905860 (or 905853 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 133158921 is about 11539.4506368371. The cubic root of 133158921 is about 510.6501013695.

The spelling of 133158921 in words is "one hundred thirty-three million, one hundred fifty-eight thousand, nine hundred twenty-one".