21002200001 has 16 divisors (see below), whose sum is σ = 21448882944. Its totient is φ = 20561259264.

The previous prime is 21002199989. The next prime is 21002200097. The reversal of 21002200001 is 10000220012.

It is a cyclic number.

It is not a de Polignac number, because 21002200001 - 2¹⁸ = 21001937857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002200201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4435031 + ... + 4439763.

It is an arithmetic number, because the mean of its divisors is an integer number (1340555184).

Almost surely, 2^21002200001 is an apocalyptic number.

It is an amenable number.

21002200001 is a deficient number, since it is larger than the sum of its proper divisors (446682943).

21002200001 is a wasteful number, since it uses less digits than its factorization.

21002200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5320.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 21002200001 its reverse (10000220012), we get a palindrome (31002420013).

The spelling of 21002200001 in words is "twenty-one billion, two million, two hundred thousand, one".