21142434324 has 96 divisors (see below), whose sum is σ = 55450200960. Its totient is φ = 6215270400.

The previous prime is 21142434277. The next prime is 21142434331. The reversal of 21142434324 is 42343424112.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21142434291 and 21142434300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 569812 + ... + 605780.

It is an arithmetic number, because the mean of its divisors is an integer number (577606260).

Almost surely, 2^21142434324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21142434324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27725100480).

21142434324 is an abundant number, since it is smaller than the sum of its proper divisors (34307766636).

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

21142434324 is a wasteful number, since it uses less digits than its factorization.

21142434324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36121 (or 36119 counting only the distinct ones).

The product of its digits is 18432, while the sum is 30.

Adding to 21142434324 its reverse (42343424112), we get a palindrome (63485858436).

The spelling of 21142434324 in words is "twenty-one billion, one hundred forty-two million, four hundred thirty-four thousand, three hundred twenty-four".