21234073072 has 20 divisors (see below), whose sum is σ = 41354188480. Its totient is φ = 10562024448.

The previous prime is 21234073043. The next prime is 21234073073. The reversal of 21234073072 is 27037043212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234073073) 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 3 ways as a sum of consecutive naturals, for example, 3435072 + ... + 3441247.

It is an arithmetic number, because the mean of its divisors is an integer number (2067709424).

Almost surely, 2^21234073072 is an apocalyptic number.

It is an amenable number.

21234073072 is a deficient number, since it is larger than the sum of its proper divisors (20120115408).

21234073072 is a wasteful number, since it uses less digits than its factorization.

21234073072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6876520 (or 6876514 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 31.

The spelling of 21234073072 in words is "twenty-one billion, two hundred thirty-four million, seventy-three thousand, seventy-two".