21003200001 has 96 divisors (see below), whose sum is σ = 38943590400. Its totient is φ = 10618283520.

The previous prime is 21003199981. The next prime is 21003200017. The reversal of 21003200001 is 10000230012.

It is a happy number.

It is not a de Polignac number, because 21003200001 - 2⁹ = 21003199489 is a prime.

It is a super-2 number, since 2×21003200001² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21003200021) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2661780 + ... + 2669658.

It is an arithmetic number, because the mean of its divisors is an integer number (405662400).

Almost surely, 2^21003200001 is an apocalyptic number.

21003200001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21003200001 is a deficient number, since it is larger than the sum of its proper divisors (17940390399).

21003200001 is a wasteful number, since it uses less digits than its factorization.

21003200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8059 (or 8056 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21003200001 its reverse (10000230012), we get a palindrome (31003430013).

The spelling of 21003200001 in words is "twenty-one billion, three million, two hundred thousand, one".