21330320001 has 4 divisors (see below), whose sum is σ = 28440426672. Its totient is φ = 14220213332.

The previous prime is 21330319963. The next prime is 21330320003. The reversal of 21330320001 is 10002303312.

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 21330320001 - 2¹⁵ = 21330287233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21330320003) 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, 3555053331 + ... + 3555053336.

It is an arithmetic number, because the mean of its divisors is an integer number (7110106668).

Almost surely, 2^21330320001 is an apocalyptic number.

It is an amenable number.

21330320001 is a deficient number, since it is larger than the sum of its proper divisors (7110106671).

21330320001 is an equidigital number, since it uses as much as digits as its factorization.

21330320001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110106670.

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21330320001 its reverse (10002303312), we get a palindrome (31332623313).

The spelling of 21330320001 in words is "twenty-one billion, three hundred thirty million, three hundred twenty thousand, one".