21330530201 has 4 divisors (see below), whose sum is σ = 21330968100. Its totient is φ = 21330092304.

The previous prime is 21330530141. The next prime is 21330530219. The reversal of 21330530201 is 10203503312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15913570201 + 5416960000 = 126149^2 + 73600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21330530201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21330530261) 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, 135206 + ... + 246863.

It is an arithmetic number, because the mean of its divisors is an integer number (5332742025).

Almost surely, 2^21330530201 is an apocalyptic number.

It is an amenable number.

21330530201 is a deficient number, since it is larger than the sum of its proper divisors (437899).

21330530201 is an equidigital number, since it uses as much as digits as its factorization.

21330530201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437898.

The product of its (nonzero) digits is 540, while the sum is 20.

The spelling of 21330530201 in words is "twenty-one billion, three hundred thirty million, five hundred thirty thousand, two hundred one".