21404404434 has 32 divisors (see below), whose sum is σ = 48945476736. Its totient is φ = 6112903680.

The previous prime is 21404404397. The next prime is 21404404451. The reversal of 21404404434 is 43440440412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10527 + ... + 207170.

It is an arithmetic number, because the mean of its divisors is an integer number (1529546148).

Almost surely, 2^21404404434 is an apocalyptic number.

21404404434 is an abundant number, since it is smaller than the sum of its proper divisors (27541072302).

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

21404404434 is a wasteful number, since it uses less digits than its factorization.

21404404434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220050.

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 21404404434 its reverse (43440440412), we get a palindrome (64844844846).

The spelling of 21404404434 in words is "twenty-one billion, four hundred four million, four hundred four thousand, four hundred thirty-four".