21142420304 has 40 divisors (see below), whose sum is σ = 43008512160. Its totient is φ = 10054332288.

The previous prime is 21142420289. The next prime is 21142420309. The reversal of 21142420304 is 40302424112.

It is a self number, because there is not a number n which added to its sum of digits gives 21142420304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142420309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308954 + ... + 371129.

It is an arithmetic number, because the mean of its divisors is an integer number (1075212804).

Almost surely, 2^21142420304 is an apocalyptic number.

It is an amenable number.

21142420304 is an abundant number, since it is smaller than the sum of its proper divisors (21866091856).

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

21142420304 is a wasteful number, since it uses less digits than its factorization.

21142420304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680187 (or 680181 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21142420304 its reverse (40302424112), we get a palindrome (61444844416).

The spelling of 21142420304 in words is "twenty-one billion, one hundred forty-two million, four hundred twenty thousand, three hundred four".