21431423404 has 24 divisors (see below), whose sum is σ = 39237202368. Its totient is φ = 10231916160.

The previous prime is 21431423389. The next prime is 21431423413. The reversal of 21431423404 is 40432413412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1382499 + ... + 1397914.

It is an arithmetic number, because the mean of its divisors is an integer number (1634883432).

Almost surely, 2^21431423404 is an apocalyptic number.

It is an amenable number.

21431423404 is a deficient number, since it is larger than the sum of its proper divisors (17805778964).

21431423404 is a wasteful number, since it uses less digits than its factorization.

21431423404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780505 (or 2780503 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21431423404 its reverse (40432413412), we get a palindrome (61863836816).

The spelling of 21431423404 in words is "twenty-one billion, four hundred thirty-one million, four hundred twenty-three thousand, four hundred four".