21421134424 has 8 divisors (see below), whose sum is σ = 40164627060. Its totient is φ = 10710567208.

The previous prime is 21421134373. The next prime is 21421134443. The reversal of 21421134424 is 42443112412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21421134424² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21421134392 and 21421134401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1338820894 + ... + 1338820909.

Almost surely, 2^21421134424 is an apocalyptic number.

It is an amenable number.

21421134424 is a deficient number, since it is larger than the sum of its proper divisors (18743492636).

21421134424 is a wasteful number, since it uses less digits than its factorization.

21421134424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677641809 (or 2677641805 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

Adding to 21421134424 its reverse (42443112412), we get a palindrome (63864246836).

The spelling of 21421134424 in words is "twenty-one billion, four hundred twenty-one million, one hundred thirty-four thousand, four hundred twenty-four".