21124312044 has 48 divisors (see below), whose sum is σ = 53843986560. Its totient is φ = 6392615040.

The previous prime is 21124312021. The next prime is 21124312067. The reversal of 21124312044 is 44021342112.

It is an interprime number because it is at equal distance from previous prime (21124312021) and next prime (21124312067).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10729 + ... + 205824.

It is an arithmetic number, because the mean of its divisors is an integer number (1121749720).

Almost surely, 2^21124312044 is an apocalyptic number.

It is an amenable number.

21124312044 is an abundant number, since it is smaller than the sum of its proper divisors (32719674516).

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

21124312044 is a wasteful number, since it uses less digits than its factorization.

21124312044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217310 (or 217308 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21124312044 its reverse (44021342112), we get a palindrome (65145654156).

The spelling of 21124312044 in words is "twenty-one billion, one hundred twenty-four million, three hundred twelve thousand, forty-four".