21485351800 has 96 divisors (see below), whose sum is σ = 56373958800. Its totient is φ = 7543424000.

The previous prime is 21485351743. The next prime is 21485351801. The reversal of 21485351800 is 815358412.

It is a self number, because there is not a number n which added to its sum of digits gives 21485351800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21485351801) 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 23 ways as a sum of consecutive naturals, for example, 104581 + ... + 232180.

Almost surely, 2^21485351800 is an apocalyptic number.

21485351800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21485351800 is an abundant number, since it is smaller than the sum of its proper divisors (34888607000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21485351800 is a wasteful number, since it uses less digits than its factorization.

21485351800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336817 (or 336808 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 21485351800 in words is "twenty-one billion, four hundred eighty-five million, three hundred fifty-one thousand, eight hundred".