21313243044 has 48 divisors (see below), whose sum is σ = 55561891840. Its totient is φ = 7065156960.

The previous prime is 21313243037. The next prime is 21313243087. The reversal of 21313243044 is 44034231312.

21313243044 is a `hidden beast` number, since 2 + 1 + 31 + 324 + 304 + 4 = 666.

It is a super-2 number, since 2×21313243044² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21313242999 and 21313243017.

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 15 ways as a sum of consecutive naturals, for example, 525604 + ... + 564699.

Almost surely, 2^21313243044 is an apocalyptic number.

It is an amenable number.

21313243044 is an abundant number, since it is smaller than the sum of its proper divisors (34248648796).

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

21313243044 is a wasteful number, since it uses less digits than its factorization.

21313243044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090497 (or 1090489 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21313243044 its reverse (44034231312), we get a palindrome (65347474356).

The spelling of 21313243044 in words is "twenty-one billion, three hundred thirteen million, two hundred forty-three thousand, forty-four".