21121211222 has 8 divisors (see below), whose sum is σ = 31685586672. Its totient is φ = 10559349000.

The previous prime is 21121211117. The next prime is 21121211261. The reversal of 21121211222 is 22211212112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21121211222² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21121211222.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 607154 + ... + 640997.

It is an arithmetic number, because the mean of its divisors is an integer number (3960698334).

Almost surely, 2^21121211222 is an apocalyptic number.

21121211222 is a deficient number, since it is larger than the sum of its proper divisors (10564375450).

21121211222 is a wasteful number, since it uses less digits than its factorization.

21121211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256614.

The product of its digits is 64, while the sum is 17.

Adding to 21121211222 its reverse (22211212112), we get a palindrome (43332423334).

It can be divided in two parts, 211212112 and 22, that multiplied together give a palindrome (4646666464).

The spelling of 21121211222 in words is "twenty-one billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty-two".