21203320001 has 4 divisors (see below), whose sum is σ = 21203996100. Its totient is φ = 21202643904.

The previous prime is 21203319931. The next prime is 21203320003. The reversal of 21203320001 is 10002330212.

It is a happy number.

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 3868964401 + 17334355600 = 62201^2 + 131660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203320001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203320003) 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, 288596 + ... + 354533.

It is an arithmetic number, because the mean of its divisors is an integer number (5300999025).

Almost surely, 2^21203320001 is an apocalyptic number.

It is an amenable number.

21203320001 is a deficient number, since it is larger than the sum of its proper divisors (676099).

21203320001 is an equidigital number, since it uses as much as digits as its factorization.

21203320001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676098.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21203320001 its reverse (10002330212), we get a palindrome (31205650213).

The spelling of 21203320001 in words is "twenty-one billion, two hundred three million, three hundred twenty thousand, one".