12222212121021 has 48 divisors (see below), whose sum is σ = 20069977521600. Its totient is φ = 6578289752832.

The previous prime is 12222212120917. The next prime is 12222212121047. The reversal of 12222212121021 is 12012121222221.

It is not a de Polignac number, because 12222212121021 - 2¹³ = 12222212112829 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 (12222212121071) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12164256 + ... + 13130633.

It is an arithmetic number, because the mean of its divisors is an integer number (418124531700).

Almost surely, 2^{12222212121021} is an apocalyptic number.

It is an amenable number.

12222212121021 is a deficient number, since it is larger than the sum of its proper divisors (7847765400579).

12222212121021 is a wasteful number, since it uses less digits than its factorization.

12222212121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25295098 (or 25295091 counting only the distinct ones).

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

Adding to 12222212121021 its reverse (12012121222221), we get a palindrome (24234333343242).

The spelling of 12222212121021 in words is "twelve trillion, two hundred twenty-two billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".