21404421134 has 4 divisors (see below), whose sum is σ = 32106631704. Its totient is φ = 10702210566.

The previous prime is 21404421131. The next prime is 21404421163. The reversal of 21404421134 is 43112440412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404421131) by changing a digit.

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 as a sum of consecutive naturals, namely, 5351105282 + ... + 5351105285.

It is an arithmetic number, because the mean of its divisors is an integer number (8026657926).

Almost surely, 2^21404421134 is an apocalyptic number.

21404421134 is a deficient number, since it is larger than the sum of its proper divisors (10702210570).

21404421134 is a wasteful number, since it uses less digits than its factorization.

21404421134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10702210569.

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

Adding to 21404421134 its reverse (43112440412), we get a palindrome (64516861546).

The spelling of 21404421134 in words is "twenty-one billion, four hundred four million, four hundred twenty-one thousand, one hundred thirty-four".