21043434244 has 24 divisors (see below), whose sum is σ = 42104901888. Its totient is φ = 9014750400.

The previous prime is 21043434233. The next prime is 21043434253. The reversal of 21043434244 is 44243434012.

It is a super-2 number, since 2×21043434244² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94009 + ... + 225664.

It is an arithmetic number, because the mean of its divisors is an integer number (1754370912).

Almost surely, 2^21043434244 is an apocalyptic number.

It is an amenable number.

21043434244 is an abundant number, since it is smaller than the sum of its proper divisors (21061467644).

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

21043434244 is a wasteful number, since it uses less digits than its factorization.

21043434244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322035 (or 322033 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 21043434244 its reverse (44243434012), we get a palindrome (65286868256).

The spelling of 21043434244 in words is "twenty-one billion, forty-three million, four hundred thirty-four thousand, two hundred forty-four".