22212111222221 has 8 divisors (see below), whose sum is σ = 22229086069344. Its totient is φ = 22195137666960.

The previous prime is 22212111222139. The next prime is 22212111222241. The reversal of 22212111222221 is 12222211121222.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22212111222221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212111222241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35600870 + ... + 36219416.

It is an arithmetic number, because the mean of its divisors is an integer number (2778635758668).

Almost surely, 2^{22212111222221} is an apocalyptic number.

It is an amenable number.

22212111222221 is a deficient number, since it is larger than the sum of its proper divisors (16974847123).

22212111222221 is a wasteful number, since it uses less digits than its factorization.

22212111222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645931.

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

Adding to 22212111222221 its reverse (12222211121222), we get a palindrome (34434322343443).

The spelling of 22212111222221 in words is "twenty-two trillion, two hundred twelve billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".