21113410344 has 128 divisors (see below), whose sum is σ = 58929171840. Its totient is φ = 6261414912.

The previous prime is 21113410313. The next prime is 21113410387. The reversal of 21113410344 is 44301431112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1226662 + ... + 1243754.

It is an arithmetic number, because the mean of its divisors is an integer number (460384155).

Almost surely, 2^21113410344 is an apocalyptic number.

21113410344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21113410344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29464585920).

21113410344 is an abundant number, since it is smaller than the sum of its proper divisors (37815761496).

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

21113410344 is a wasteful number, since it uses less digits than its factorization.

21113410344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17259 (or 17255 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21113410344 its reverse (44301431112), we get a palindrome (65414841456).

The spelling of 21113410344 in words is "twenty-one billion, one hundred thirteen million, four hundred ten thousand, three hundred forty-four".