21222211101 has 96 divisors (see below), whose sum is σ = 38324684160. Its totient is φ = 10317694464.

The previous prime is 21222211097. The next prime is 21222211111. The reversal of 21222211101 is 10111222212.

It is not a de Polignac number, because 21222211101 - 2² = 21222211097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222211111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1335535 + ... + 1351331.

It is an arithmetic number, because the mean of its divisors is an integer number (399215460).

Almost surely, 2^21222211101 is an apocalyptic number.

21222211101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21222211101 is a deficient number, since it is larger than the sum of its proper divisors (17102473059).

21222211101 is a wasteful number, since it uses less digits than its factorization.

21222211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15883 (or 15876 counting only the distinct ones).

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

Adding to 21222211101 its reverse (10111222212), we get a palindrome (31333433313).

The spelling of 21222211101 in words is "twenty-one billion, two hundred twenty-two million, two hundred eleven thousand, one hundred one".