12221021142 has 48 divisors (see below), whose sum is σ = 29557839168. Its totient is φ = 3617213040.

The previous prime is 12221021053. The next prime is 12221021147. The reversal of 12221021142 is 24112012221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221021147) 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, 709188 + ... + 726215.

It is an arithmetic number, because the mean of its divisors is an integer number (615788316).

Almost surely, 2^12221021142 is an apocalyptic number.

12221021142 is an abundant number, since it is smaller than the sum of its proper divisors (17336818026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221021142 is a wasteful number, since it uses less digits than its factorization.

12221021142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435465 (or 1435462 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12221021142 its reverse (24112012221), we get a palindrome (36333033363).

The spelling of 12221021142 in words is "twelve billion, two hundred twenty-one million, twenty-one thousand, one hundred forty-two".