21126440924 has 12 divisors (see below), whose sum is σ = 37002270144. Its totient is φ = 10554363744.

The previous prime is 21126440903. The next prime is 21126440963. The reversal of 21126440924 is 42904462112.

It is a super-2 number, since 2×21126440924² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2208812 + ... + 2218355.

It is an arithmetic number, because the mean of its divisors is an integer number (3083522512).

Almost surely, 2^21126440924 is an apocalyptic number.

It is an amenable number.

21126440924 is a deficient number, since it is larger than the sum of its proper divisors (15875829220).

21126440924 is a wasteful number, since it uses less digits than its factorization.

21126440924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428364 (or 4428362 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 21126440924 in words is "twenty-one billion, one hundred twenty-six million, four hundred forty thousand, nine hundred twenty-four".