133000021 has 8 divisors (see below), whose sum is σ = 165818304. Its totient is φ = 103636320.

The previous prime is 133000009. The next prime is 133000033. The reversal of 133000021 is 120000331.

It is an interprime number because it is at equal distance from previous prime (133000009) and next prime (133000033).

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 133000021 - 2¹⁵ = 132967253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 132999971 and 133000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133000001) 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, 863560 + ... + 863713.

It is an arithmetic number, because the mean of its divisors is an integer number (20727288).

Almost surely, 2^133000021 is an apocalyptic number.

133000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133000021 is a deficient number, since it is larger than the sum of its proper divisors (32818283).

133000021 is a wasteful number, since it uses less digits than its factorization.

133000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1727291.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 133000021 is about 11532.5635051362. The cubic root of 133000021 is about 510.4468990658.

Adding to 133000021 its reverse (120000331), we get a palindrome (253000352).

The spelling of 133000021 in words is "one hundred thirty-three million, twenty-one", and thus it is an aban number.