21486541994820 has 96 divisors (see below), whose sum is σ = 76396593772800. Its totient is φ = 4911209597952.

The previous prime is 21486541994809. The next prime is 21486541994843. The reversal of 21486541994820 is 2849914568412.

It is a happy number.

21486541994820 is a `hidden beast` number, since 2 + 1 + 4 + 8 + 6 + 541 + 9 + 9 + 4 + 82 + 0 = 666.

21486541994820 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2842131405 + ... + 2842138964.

It is an arithmetic number, because the mean of its divisors is an integer number (795797851800).

Almost surely, 2^{21486541994820} is an apocalyptic number.

21486541994820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21486541994820 is an abundant number, since it is smaller than the sum of its proper divisors (54910051777980).

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

21486541994820 is a wasteful number, since it uses less digits than its factorization.

21486541994820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5684270394 (or 5684270386 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 63.

The spelling of 21486541994820 in words is "twenty-one trillion, four hundred eighty-six billion, five hundred forty-one million, nine hundred ninety-four thousand, eight hundred twenty".