21400004404 has 12 divisors (see below), whose sum is σ = 38156612004. Its totient is φ = 10498115264.

The previous prime is 21400004383. The next prime is 21400004411. The reversal of 21400004404 is 40440000412.

It can be written as a sum of positive squares in 2 ways, for example, as 17782222500 + 3617781904 = 133350^2 + 60148^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50471497 + ... + 50471920.

It is an arithmetic number, because the mean of its divisors is an integer number (3179717667).

Almost surely, 2^21400004404 is an apocalyptic number.

It is an amenable number.

21400004404 is a deficient number, since it is larger than the sum of its proper divisors (16756607600).

21400004404 is a wasteful number, since it uses less digits than its factorization.

21400004404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100943474 (or 100943472 counting only the distinct ones).

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

Adding to 21400004404 its reverse (40440000412), we get a palindrome (61840004816).

The spelling of 21400004404 in words is "twenty-one billion, four hundred million, four thousand, four hundred four".