22021221212 has 6 divisors (see below), whose sum is σ = 38537137128. Its totient is φ = 11010610604.

The previous prime is 22021221169. The next prime is 22021221221. The reversal of 22021221212 is 21212212022.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2752652648 + ... + 2752652655.

It is an arithmetic number, because the mean of its divisors is an integer number (6422856188).

Almost surely, 2^22021221212 is an apocalyptic number.

It is an amenable number.

22021221212 is a deficient number, since it is larger than the sum of its proper divisors (16515915916).

22021221212 is a wasteful number, since it uses less digits than its factorization.

22021221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5505305307 (or 5505305305 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22021221212 its reverse (21212212022), we get a palindrome (43233433234).

The spelling of 22021221212 in words is "twenty-two billion, twenty-one million, two hundred twenty-one thousand, two hundred twelve".