21211000001 has 8 divisors (see below), whose sum is σ = 21485759808. Its totient is φ = 20937510000.

The previous prime is 21210999989. The next prime is 21211000073. The reversal of 21211000001 is 10000011212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211000001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211080001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283805 + ... + 350666.

It is an arithmetic number, because the mean of its divisors is an integer number (2685719976).

Almost surely, 2^21211000001 is an apocalyptic number.

It is an amenable number.

21211000001 is a deficient number, since it is larger than the sum of its proper divisors (274759807).

21211000001 is a wasteful number, since it uses less digits than its factorization.

21211000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634903.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21211000001 its reverse (10000011212), we get a palindrome (31211011213).

The spelling of 21211000001 in words is "twenty-one billion, two hundred eleven million, one", and thus it is an aban number.