21221102211 has 32 divisors (see below), whose sum is σ = 29912432640. Its totient is φ = 13365668736.

The previous prime is 21221102209. The next prime is 21221102249. The reversal of 21221102211 is 11220112212.

It is not a de Polignac number, because 21221102211 - 2¹ = 21221102209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221102281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 646545 + ... + 678573.

It is an arithmetic number, because the mean of its divisors is an integer number (934763520).

Almost surely, 2^21221102211 is an apocalyptic number.

21221102211 is a deficient number, since it is larger than the sum of its proper divisors (8691330429).

21221102211 is a wasteful number, since it uses less digits than its factorization.

21221102211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32243.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221102211 its reverse (11220112212), we get a palindrome (32441214423).

The spelling of 21221102211 in words is "twenty-one billion, two hundred twenty-one million, one hundred two thousand, two hundred eleven".