21032000001 has 20 divisors (see below), whose sum is σ = 31426745812. Its totient is φ = 14017507488.

The previous prime is 21031999999. The next prime is 21032000039. The reversal of 21032000001 is 10000023012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5010516225 + 16021483776 = 70785^2 + 126576^2 .

It is not a de Polignac number, because 21032000001 - 2¹ = 21031999999 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21032002001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 280551 + ... + 347523.

Almost surely, 2^21032000001 is an apocalyptic number.

It is an amenable number.

21032000001 is a deficient number, since it is larger than the sum of its proper divisors (10394745811).

21032000001 is an equidigital number, since it uses as much as digits as its factorization.

21032000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70862 (or 70853 counting only the distinct ones).

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

Adding to 21032000001 its reverse (10000023012), we get a palindrome (31032023013).

The spelling of 21032000001 in words is "twenty-one billion, thirty-two million, one", and thus it is an aban number and an uban number.