21433468844 has 24 divisors (see below), whose sum is σ = 38343019008. Its totient is φ = 10478754000.

The previous prime is 21433468843. The next prime is 21433468867. The reversal of 21433468844 is 44886433412.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is not an unprimeable number, because it can be changed into a prime (21433468841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146219 + ... + 253469.

It is an arithmetic number, because the mean of its divisors is an integer number (1597625792).

Almost surely, 2^21433468844 is an apocalyptic number.

It is an amenable number.

21433468844 is a deficient number, since it is larger than the sum of its proper divisors (16909550164).

21433468844 is a wasteful number, since it uses less digits than its factorization.

21433468844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108365 (or 108363 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 47.

The spelling of 21433468844 in words is "twenty-one billion, four hundred thirty-three million, four hundred sixty-eight thousand, eight hundred forty-four".