21421134404 has 24 divisors (see below), whose sum is σ = 37727601408. Its totient is φ = 10641990240.

The previous prime is 21421134373. The next prime is 21421134443. The reversal of 21421134404 is 40443112412.

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, 491402 + ... + 533214.

It is an arithmetic number, because the mean of its divisors is an integer number (1571983392).

Almost surely, 2^21421134404 is an apocalyptic number.

It is an amenable number.

21421134404 is a deficient number, since it is larger than the sum of its proper divisors (16306467004).

21421134404 is a wasteful number, since it uses less digits than its factorization.

21421134404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42635 (or 42633 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21421134404 its reverse (40443112412), we get a palindrome (61864246816).

The spelling of 21421134404 in words is "twenty-one billion, four hundred twenty-one million, one hundred thirty-four thousand, four hundred four".