22021211211221 has 8 divisors (see below), whose sum is σ = 22129932789888. Its totient is φ = 21912530724000.

The previous prime is 22021211211191. The next prime is 22021211211253. The reversal of 22021211211221 is 12211211212022.

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

It is a cyclic number.

It is not a de Polignac number, because 22021211211221 - 2¹⁰ = 22021211210197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22021211211193 and 22021211211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021211217221) 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, 9198125 + ... + 11342306.

It is an arithmetic number, because the mean of its divisors is an integer number (2766241598736).

Almost surely, 2^{22021211211221} is an apocalyptic number.

It is an amenable number.

22021211211221 is a deficient number, since it is larger than the sum of its proper divisors (108721578667).

22021211211221 is a wasteful number, since it uses less digits than its factorization.

22021211211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20545723.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 22021211211221 its reverse (12211211212022), we get a palindrome (34232422423243).

The spelling of 22021211211221 in words is "twenty-two trillion, twenty-one billion, two hundred eleven million, two hundred eleven thousand, two hundred twenty-one".