21221111222222 has 8 divisors (see below), whose sum is σ = 32026953133416. Its totient is φ = 10545460177752.

The previous prime is 21221111222177. The next prime is 21221111222273. The reversal of 21221111222222 is 22222211112212.

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

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32547716273 + ... + 32547716924.

It is an arithmetic number, because the mean of its divisors is an integer number (4003369141677).

Almost surely, 2^{21221111222222} is an apocalyptic number.

21221111222222 is a deficient number, since it is larger than the sum of its proper divisors (10805841911194).

21221111222222 is a wasteful number, since it uses less digits than its factorization.

21221111222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65095433362.

The product of its digits is 512, while the sum is 23.

Adding to 21221111222222 its reverse (22222211112212), we get a palindrome (43443322334434).

The spelling of 21221111222222 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-two".