21421134403 has 8 divisors (see below), whose sum is σ = 22181528880. Its totient is φ = 20662188960.

The previous prime is 21421134373. The next prime is 21421134443. The reversal of 21421134403 is 30443112412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21421134403 - 2³³ = 12831199811 is a prime.

It is a super-2 number, since 2×21421134403² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21421134443) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 332125 + ... + 391342.

It is an arithmetic number, because the mean of its divisors is an integer number (2772691110).

Almost surely, 2^21421134403 is an apocalyptic number.

21421134403 is a deficient number, since it is larger than the sum of its proper divisors (760394477).

21421134403 is a wasteful number, since it uses less digits than its factorization.

21421134403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724517.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21421134403 its reverse (30443112412), we get a palindrome (51864246815).

The spelling of 21421134403 in words is "twenty-one billion, four hundred twenty-one million, one hundred thirty-four thousand, four hundred three".