22012211221 has 24 divisors (see below), whose sum is σ = 29778772352. Its totient is φ = 15832951200.

The previous prime is 22012211191. The next prime is 22012211237. The reversal of 22012211221 is 12211221022.

It is a happy number.

It is not a de Polignac number, because 22012211221 - 2²¹ = 22010114069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22012211195 and 22012211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012211251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 988545 + ... + 1010566.

Almost surely, 2^22012211221 is an apocalyptic number.

It is an amenable number.

22012211221 is a deficient number, since it is larger than the sum of its proper divisors (7766561131).

22012211221 is a wasteful number, since it uses less digits than its factorization.

22012211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999153 (or 1999142 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22012211221 its reverse (12211221022), we get a palindrome (34223432243).

The spelling of 22012211221 in words is "twenty-two billion, twelve million, two hundred eleven thousand, two hundred twenty-one".