21010000001 has 8 divisors (see below), whose sum is σ = 22278465504. Its totient is φ = 19745154880.

The previous prime is 21009999971. The next prime is 21010000009. The reversal of 21010000001 is 10000001012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21010000001 - 2¹⁸ = 21009737857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010000001.

It is not an unprimeable number, because it can be changed into a prime (21010000009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 893135 + ... + 916356.

It is an arithmetic number, because the mean of its divisors is an integer number (2784808188).

Almost surely, 2^21010000001 is an apocalyptic number.

It is an amenable number.

21010000001 is a deficient number, since it is larger than the sum of its proper divisors (1268465503).

21010000001 is a wasteful number, since it uses less digits than its factorization.

21010000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810191.

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 21010000001 its reverse (10000001012), we get a palindrome (31010001013).

The spelling of 21010000001 in words is "twenty-one billion, ten million, one", and thus it is an aban number and an uban number.