21810734258 has 16 divisors (see below), whose sum is σ = 35021700000. Its totient is φ = 10156290912.

The previous prime is 21810734251. The next prime is 21810734269. The reversal of 21810734258 is 85243701812.

It is not an unprimeable number, because it can be changed into a prime (21810734251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4861883 + ... + 4866366.

It is an arithmetic number, because the mean of its divisors is an integer number (2188856250).

Almost surely, 2^21810734258 is an apocalyptic number.

21810734258 is a deficient number, since it is larger than the sum of its proper divisors (13210965742).

21810734258 is a wasteful number, since it uses less digits than its factorization.

21810734258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9728329.

The product of its (nonzero) digits is 107520, while the sum is 41.

The spelling of 21810734258 in words is "twenty-one billion, eight hundred ten million, seven hundred thirty-four thousand, two hundred fifty-eight".