21113487344 has 40 divisors (see below), whose sum is σ = 43110045840. Its totient is φ = 9989595648.

The previous prime is 21113487301. The next prime is 21113487349. The reversal of 21113487344 is 44378431112.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 21113487298 and 21113487307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113487349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227012 + ... + 306204.

It is an arithmetic number, because the mean of its divisors is an integer number (1077751146).

Almost surely, 2^21113487344 is an apocalyptic number.

It is an amenable number.

21113487344 is an abundant number, since it is smaller than the sum of its proper divisors (21996558496).

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

21113487344 is a wasteful number, since it uses less digits than its factorization.

21113487344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80097 (or 80091 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The spelling of 21113487344 in words is "twenty-one billion, one hundred thirteen million, four hundred eighty-seven thousand, three hundred forty-four".