21222212011 has 96 divisors (see below), whose sum is σ = 29488098816. Its totient is φ = 14826240000.

The previous prime is 21222211999. The next prime is 21222212029. The reversal of 21222212011 is 11021222212.

It is a happy number.

It is not a de Polignac number, because 21222212011 - 2²⁵ = 21188657579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222212111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 88058851 + ... + 88059091.

It is an arithmetic number, because the mean of its divisors is an integer number (307167696).

Almost surely, 2^21222212011 is an apocalyptic number.

21222212011 is a deficient number, since it is larger than the sum of its proper divisors (8265886805).

21222212011 is a wasteful number, since it uses less digits than its factorization.

21222212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453 (or 440 counting only the distinct ones).

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

Adding to 21222212011 its reverse (11021222212), we get a palindrome (32243434223).

The spelling of 21222212011 in words is "twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, eleven".