21431042404 has 24 divisors (see below), whose sum is σ = 38239536888. Its totient is φ = 10506570240.

The previous prime is 21431042359. The next prime is 21431042411. The reversal of 21431042404 is 40424013412.

It can be written as a sum of positive squares in 4 ways, for example, as 1296000000 + 20135042404 = 36000^2 + 141898^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61189 + ... + 215884.

It is an arithmetic number, because the mean of its divisors is an integer number (1593314037).

Almost surely, 2^21431042404 is an apocalyptic number.

It is an amenable number.

21431042404 is a deficient number, since it is larger than the sum of its proper divisors (16808494484).

21431042404 is a wasteful number, since it uses less digits than its factorization.

21431042404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277455 (or 277453 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21431042404 its reverse (40424013412), we get a palindrome (61855055816).

The spelling of 21431042404 in words is "twenty-one billion, four hundred thirty-one million, forty-two thousand, four hundred four".