21085473060 has 144 divisors (see below), whose sum is σ = 67993248960. Its totient is φ = 5274028800.

The previous prime is 21085473047. The next prime is 21085473083. The reversal of 21085473060 is 6037458012.

21085473060 is a `hidden beast` number, since 2 + 108 + 547 + 3 + 0 + 6 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 314899 + ... + 375941.

It is an arithmetic number, because the mean of its divisors is an integer number (472175340).

Almost surely, 2^21085473060 is an apocalyptic number.

21085473060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21085473060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33996624480).

21085473060 is an abundant number, since it is smaller than the sum of its proper divisors (46907775900).

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

21085473060 is a wasteful number, since it uses less digits than its factorization.

21085473060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61178 (or 61173 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

21085473060 divided by its sum of digits (36) gives a palindrome (585707585).

The spelling of 21085473060 in words is "twenty-one billion, eighty-five million, four hundred seventy-three thousand, sixty".