21342441564 has 36 divisors (see below), whose sum is σ = 53953383120. Its totient is φ = 7113562560.

The previous prime is 21342441559. The next prime is 21342441577. The reversal of 21342441564 is 46514424312.

21342441564 is a `hidden beast` number, since 2 + 1 + 34 + 24 + 41 + 564 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 in 11 ways as a sum of consecutive naturals, for example, 837369 + ... + 862479.

Almost surely, 2^21342441564 is an apocalyptic number.

It is an amenable number.

21342441564 is an abundant number, since it is smaller than the sum of its proper divisors (32610941556).

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

21342441564 is a wasteful number, since it uses less digits than its factorization.

21342441564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48730 (or 48725 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

Adding to 21342441564 its reverse (46514424312), we get a palindrome (67856865876).

The spelling of 21342441564 in words is "twenty-one billion, three hundred forty-two million, four hundred forty-one thousand, five hundred sixty-four".