21134719564 has 12 divisors (see below), whose sum is σ = 42269439184. Its totient is φ = 9057736944.

The previous prime is 21134719517. The next prime is 21134719603. The reversal of 21134719564 is 46591743112.

It is a happy number.

21134719564 is an admirable number.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21134719564.

It is an unprimeable number.

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, 377405679 + ... + 377405734.

Almost surely, 2^21134719564 is an apocalyptic number.

It is an amenable number.

21134719564 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21134719564 is a wasteful number, since it uses less digits than its factorization.

21134719564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754811424 (or 754811422 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The spelling of 21134719564 in words is "twenty-one billion, one hundred thirty-four million, seven hundred nineteen thousand, five hundred sixty-four".