133021001 has 8 divisors (see below), whose sum is σ = 134622600. Its totient is φ = 131427072.

The previous prime is 133020997. The next prime is 133021013. The reversal of 133021001 is 100120331.

It can be written as a sum of positive squares in 4 ways, for example, as 33918976 + 99102025 = 5824^2 + 9955^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133021001 - 2² = 133020997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133021051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37751 + ... + 41123.

It is an arithmetic number, because the mean of its divisors is an integer number (16827825).

Almost surely, 2^133021001 is an apocalyptic number.

It is an amenable number.

133021001 is a deficient number, since it is larger than the sum of its proper divisors (1601599).

133021001 is a wasteful number, since it uses less digits than its factorization.

133021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3835.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 133021001 is about 11533.4730675543. The cubic root of 133021001 is about 510.4737376903.

Adding to 133021001 its reverse (100120331), we get a palindrome (233141332).

The spelling of 133021001 in words is "one hundred thirty-three million, twenty-one thousand, one".