22202121211221 has 32 divisors (see below), whose sum is σ = 34793580414208. Its totient is φ = 12327195755520.

The previous prime is 22202121211211. The next prime is 22202121211253. The reversal of 22202121211221 is 12211212120222.

It is not a de Polignac number, because 22202121211221 - 2¹⁰ = 22202121210197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22202121211201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18921700 + ... + 20060781.

It is an arithmetic number, because the mean of its divisors is an integer number (1087299387944).

Almost surely, 2^{22202121211221} is an apocalyptic number.

22202121211221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22202121211221 is a deficient number, since it is larger than the sum of its proper divisors (12591459202987).

22202121211221 is a wasteful number, since it uses less digits than its factorization.

22202121211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38983261.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 22202121211221 its reverse (12211212120222), we get a palindrome (34413333331443).

Subtracting from 22202121211221 its reverse (12211212120222), we obtain a palindrome (9990909090999).

The spelling of 22202121211221 in words is "twenty-two trillion, two hundred two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".