21342235424 has 24 divisors (see below), whose sum is σ = 42060332160. Its totient is φ = 10660246336.

The previous prime is 21342235423. The next prime is 21342235427. The reversal of 21342235424 is 42453224312.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (21342235423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307784 + ... + 370695.

It is an arithmetic number, because the mean of its divisors is an integer number (1752513840).

Almost surely, 2^21342235424 is an apocalyptic number.

It is an amenable number.

21342235424 is a deficient number, since it is larger than the sum of its proper divisors (20718096736).

21342235424 is an equidigital number, since it uses as much as digits as its factorization.

21342235424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679472 (or 679464 counting only the distinct ones).

The product of its digits is 46080, while the sum is 32.

Adding to 21342235424 its reverse (42453224312), we get a palindrome (63795459736).

The spelling of 21342235424 in words is "twenty-one billion, three hundred forty-two million, two hundred thirty-five thousand, four hundred twenty-four".