12021434502 has 128 divisors (see below), whose sum is σ = 32387558400. Its totient is φ = 2938682880.

The previous prime is 12021434497. The next prime is 12021434521. The reversal of 12021434502 is 20543412021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 369228 + ... + 400464.

It is an arithmetic number, because the mean of its divisors is an integer number (253027800).

Almost surely, 2^12021434502 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021434502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16193779200).

12021434502 is an abundant number, since it is smaller than the sum of its proper divisors (20366123898).

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

12021434502 is a wasteful number, since it uses less digits than its factorization.

12021434502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31291 (or 31277 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 12021434502 its reverse (20543412021), we get a palindrome (32564846523).

The spelling of 12021434502 in words is "twelve billion, twenty-one million, four hundred thirty-four thousand, five hundred two".