21474866880 has 224 divisors, whose sum is σ = 76358983680. Its totient is φ = 5681249280.

The previous prime is 21474866857. The next prime is 21474866891. The reversal of 21474866880 is 8866847412.

21474866880 is a `hidden beast` number, since 21 + 4 + 7 + 486 + 68 + 80 = 666.

It is a super-2 number, since 2×21474866880² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 1087495 + ... + 1107065.

It is an arithmetic number, because the mean of its divisors is an integer number (340888320).

Almost surely, 2^21474866880 is an apocalyptic number.

21474866880 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 21474866880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38179491840).

21474866880 is an abundant number, since it is smaller than the sum of its proper divisors (54884116800).

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

21474866880 is a wasteful number, since it uses less digits than its factorization.

21474866880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19724 (or 19708 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 54.

The spelling of 21474866880 in words is "twenty-one billion, four hundred seventy-four million, eight hundred sixty-six thousand, eight hundred eighty".