21486694186944 has 168 divisors, whose sum is σ = 72288300582368. Its totient is φ = 5973135022080.

The previous prime is 21486694186931. The next prime is 21486694187081. The reversal of 21486694186944 is 44968149668412.

21486694186944 is a `hidden beast` number, since 2 + 1 + 486 + 6 + 9 + 41 + 8 + 69 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71864887 + ... + 72163254.

Almost surely, 2^{21486694186944} is an apocalyptic number.

21486694186944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21486694186944 is an abundant number, since it is smaller than the sum of its proper divisors (50801606395424).

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

21486694186944 is a wasteful number, since it uses less digits than its factorization.

21486694186944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144028203 (or 144028190 counting only the distinct ones).

The product of its digits is 573308928, while the sum is 72.

The spelling of 21486694186944 in words is "twenty-one trillion, four hundred eighty-six billion, six hundred ninety-four million, one hundred eighty-six thousand, nine hundred forty-four".