133530628721 has 4 divisors (see below), whose sum is σ = 152606432832. Its totient is φ = 114454824612.

The previous prime is 133530628703. The next prime is 133530628783. The reversal of 133530628721 is 127826035331.

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 133530628721 - 2¹⁰ = 133530627697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133530628321) 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, 9537902045 + ... + 9537902058.

It is an arithmetic number, because the mean of its divisors is an integer number (38151608208).

Almost surely, 2^133530628721 is an apocalyptic number.

It is an amenable number.

133530628721 is a deficient number, since it is larger than the sum of its proper divisors (19075804111).

133530628721 is an equidigital number, since it uses as much as digits as its factorization.

133530628721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19075804110.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 133530628721 in words is "one hundred thirty-three billion, five hundred thirty million, six hundred twenty-eight thousand, seven hundred twenty-one".