133130021 has 4 divisors (see below), whose sum is σ = 136226112. Its totient is φ = 130033932.

The previous prime is 133129987. The next prime is 133130047. The reversal of 133130021 is 120031331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133130021 - 2¹⁸ = 132867877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133129978 and 133130005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133130051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1547981 + ... + 1548066.

It is an arithmetic number, because the mean of its divisors is an integer number (34056528).

Almost surely, 2^133130021 is an apocalyptic number.

It is an amenable number.

133130021 is a deficient number, since it is larger than the sum of its proper divisors (3096091).

133130021 is an equidigital number, since it uses as much as digits as its factorization.

133130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096090.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 133130021 is about 11538.1983428957. The cubic root of 133130021 is about 510.6131559021.

Adding to 133130021 its reverse (120031331), we get a palindrome (253161352).

The spelling of 133130021 in words is "one hundred thirty-three million, one hundred thirty thousand, twenty-one".