21134404064 has 24 divisors (see below), whose sum is σ = 43798272840. Its totient is φ = 10011033216.

The previous prime is 21134404061. The next prime is 21134404069. The reversal of 21134404064 is 46040443112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134404061) 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 in 3 ways as a sum of consecutive naturals, for example, 17379659 + ... + 17380874.

It is an arithmetic number, because the mean of its divisors is an integer number (1824928035).

Almost surely, 2^21134404064 is an apocalyptic number.

It is an amenable number.

21134404064 is an abundant number, since it is smaller than the sum of its proper divisors (22663868776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21134404064 is a wasteful number, since it uses less digits than its factorization.

21134404064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34760562 (or 34760554 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 21134404064 its reverse (46040443112), we get a palindrome (67174847176).

The spelling of 21134404064 in words is "twenty-one billion, one hundred thirty-four million, four hundred four thousand, sixty-four".