12021340422 has 96 divisors (see below), whose sum is σ = 30154862304. Its totient is φ = 3166732800.

The previous prime is 12021340421. The next prime is 12021340423. The reversal of 12021340422 is 22404312021.

It is an interprime number because it is at equal distance from previous prime (12021340421) and next prime (12021340423).

It is a super-2 number, since 2×12021340422² (a number of 21 digits) contains 22 as substring.

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 (12021340421) 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, 5047672 + ... + 5050052.

It is an arithmetic number, because the mean of its divisors is an integer number (314113149).

Almost surely, 2^12021340422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021340422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15077431152).

12021340422 is an abundant number, since it is smaller than the sum of its proper divisors (18133521882).

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

12021340422 is a wasteful number, since it uses less digits than its factorization.

12021340422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3734 (or 3727 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 12021340422 its reverse (22404312021), we get a palindrome (34425652443).

The spelling of 12021340422 in words is "twelve billion, twenty-one million, three hundred forty thousand, four hundred twenty-two".