21122202211 has 16 divisors (see below), whose sum is σ = 24403040640. Its totient is φ = 18068618880.

The previous prime is 21122202203. The next prime is 21122202259. The reversal of 21122202211 is 11220222112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21122202211 - 2³ = 21122202203 is a prime.

It is a super-2 number, since 2×21122202211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122202281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1184020 + ... + 1201726.

It is an arithmetic number, because the mean of its divisors is an integer number (1525190040).

Almost surely, 2^21122202211 is an apocalyptic number.

21122202211 is a deficient number, since it is larger than the sum of its proper divisors (3280838429).

21122202211 is a wasteful number, since it uses less digits than its factorization.

21122202211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24114.

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

Adding to 21122202211 its reverse (11220222112), we get a palindrome (32342424323).

The spelling of 21122202211 in words is "twenty-one billion, one hundred twenty-two million, two hundred two thousand, two hundred eleven".