21022212211 has 72 divisors (see below), whose sum is σ = 29229303600. Its totient is φ = 14973678720.

The previous prime is 21022212209. The next prime is 21022212227. The reversal of 21022212211 is 11221222012.

It is a happy number.

It is not a de Polignac number, because 21022212211 - 2¹ = 21022212209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022216211) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8245965 + ... + 8248513.

It is an arithmetic number, because the mean of its divisors is an integer number (405962550).

Almost surely, 2^21022212211 is an apocalyptic number.

21022212211 is a deficient number, since it is larger than the sum of its proper divisors (8207091389).

21022212211 is a wasteful number, since it uses less digits than its factorization.

21022212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705 (or 2687 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21022212211 its reverse (11221222012), we get a palindrome (32243434223).

The spelling of 21022212211 in words is "twenty-one billion, twenty-two million, two hundred twelve thousand, two hundred eleven".