133448021 has 12 divisors (see below), whose sum is σ = 155854188. Its totient is φ = 113928192.

The previous prime is 133448017. The next prime is 133448023. The reversal of 133448021 is 120844331.

It can be written as a sum of positive squares in 2 ways, for example, as 70324996 + 63123025 = 8386^2 + 7945^2 .

It is not a de Polignac number, because 133448021 - 2² = 133448017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133448023) 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, 7295 + ... + 17891.

It is an arithmetic number, because the mean of its divisors is an integer number (12987849).

Almost surely, 2^133448021 is an apocalyptic number.

It is an amenable number.

133448021 is a deficient number, since it is larger than the sum of its proper divisors (22406167).

133448021 is a wasteful number, since it uses less digits than its factorization.

133448021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10868 (or 10861 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 133448021 is about 11551.9704379816. The cubic root of 133448021 is about 511.0193900192.

The spelling of 133448021 in words is "one hundred thirty-three million, four hundred forty-eight thousand, twenty-one".