21330010001 has 4 divisors (see below), whose sum is σ = 21330583092. Its totient is φ = 21329436912.

The previous prime is 21330009959. The next prime is 21330010019. The reversal of 21330010001 is 10001003312.

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 13368909376 + 7961100625 = 115624^2 + 89225^2 .

It is a cyclic number.

It is not a de Polignac number, because 21330010001 - 2¹⁰ = 21330008977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21330010301) 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, 226526 + ... + 306551.

It is an arithmetic number, because the mean of its divisors is an integer number (5332645773).

Almost surely, 2^21330010001 is an apocalyptic number.

It is an amenable number.

21330010001 is a deficient number, since it is larger than the sum of its proper divisors (573091).

21330010001 is an equidigital number, since it uses as much as digits as its factorization.

21330010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573090.

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

Adding to 21330010001 its reverse (10001003312), we get a palindrome (31331013313).

The spelling of 21330010001 in words is "twenty-one billion, three hundred thirty million, ten thousand, one".