21201001211 has 8 divisors (see below), whose sum is σ = 24033523920. Its totient is φ = 18540146592.

The previous prime is 21201001207. The next prime is 21201001219. The reversal of 21201001211 is 11210010212.

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 21201001211 - 2² = 21201001207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201001192 and 21201001201.

It is not an unprimeable number, because it can be changed into a prime (21201001219) 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, 42916760 + ... + 42917253.

It is an arithmetic number, because the mean of its divisors is an integer number (3004190490).

Almost surely, 2^21201001211 is an apocalyptic number.

21201001211 is a deficient number, since it is larger than the sum of its proper divisors (2832522709).

21201001211 is a wasteful number, since it uses less digits than its factorization.

21201001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85834045.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21201001211 its reverse (11210010212), we get a palindrome (32411011423).

Subtracting from 21201001211 its reverse (11210010212), we obtain a palindrome (9990990999).

The spelling of 21201001211 in words is "twenty-one billion, two hundred one million, one thousand, two hundred eleven".