21404430354 has 64 divisors (see below), whose sum is σ = 45400320000. Its totient is φ = 6708744000.

The previous prime is 21404430343. The next prime is 21404430367. The reversal of 21404430354 is 45303440412.

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, 9507729 + ... + 9509979.

It is an arithmetic number, because the mean of its divisors is an integer number (709380000).

Almost surely, 2^21404430354 is an apocalyptic number.

21404430354 is an abundant number, since it is smaller than the sum of its proper divisors (23995889646).

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

21404430354 is a wasteful number, since it uses less digits than its factorization.

21404430354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863.

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 21404430354 its reverse (45303440412), we get a palindrome (66707870766).

The spelling of 21404430354 in words is "twenty-one billion, four hundred four million, four hundred thirty thousand, three hundred fifty-four".