21200042404 has 12 divisors (see below), whose sum is σ = 37889437824. Its totient is φ = 10374488744.

The previous prime is 21200042377. The next prime is 21200042407. The reversal of 21200042404 is 40424000212.

It is not an unprimeable number, because it can be changed into a prime (21200042407) 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, 56382904 + ... + 56383279.

It is an arithmetic number, because the mean of its divisors is an integer number (3157453152).

Almost surely, 2^21200042404 is an apocalyptic number.

It is an amenable number.

21200042404 is a deficient number, since it is larger than the sum of its proper divisors (16689395420).

21200042404 is a wasteful number, since it uses less digits than its factorization.

21200042404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112766234 (or 112766232 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 21200042404 its reverse (40424000212), we get a palindrome (61624042616).

The spelling of 21200042404 in words is "twenty-one billion, two hundred million, forty-two thousand, four hundred four".