21485454934 has 16 divisors (see below), whose sum is σ = 32613807600. Its totient is φ = 10614360064.

The previous prime is 21485454919. The next prime is 21485454989. The reversal of 21485454934 is 43945458412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207969 + ... + 293635.

It is an arithmetic number, because the mean of its divisors is an integer number (2038362975).

Almost surely, 2^21485454934 is an apocalyptic number.

21485454934 is a deficient number, since it is larger than the sum of its proper divisors (11128352666).

21485454934 is a wasteful number, since it uses less digits than its factorization.

21485454934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87167.

The product of its digits is 2764800, while the sum is 49.

The spelling of 21485454934 in words is "twenty-one billion, four hundred eighty-five million, four hundred fifty-four thousand, nine hundred thirty-four".