21081477478482 has 128 divisors (see below), whose sum is σ = 48554156851200. Its totient is φ = 6772117665600.

The previous prime is 21081477478441. The next prime is 21081477478489. The reversal of 21081477478482 is 28487477418012.

It is a happy number.

21081477478482 is a `hidden beast` number, since 2 + 1 + 0 + 8 + 1 + 477 + 4 + 7 + 84 + 82 = 666.

It is not an unprimeable number, because it can be changed into a prime (21081477478489) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1987500823 + ... + 1987511429.

It is an arithmetic number, because the mean of its divisors is an integer number (379329350400).

Almost surely, 2^{21081477478482} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21081477478482, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24277078425600).

21081477478482 is an abundant number, since it is smaller than the sum of its proper divisors (27472679372718).

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

21081477478482 is a wasteful number, since it uses less digits than its factorization.

21081477478482 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12909 (or 12903 counting only the distinct ones).

The product of its (nonzero) digits is 44957696, while the sum is 63.

The spelling of 21081477478482 in words is "twenty-one trillion, eighty-one billion, four hundred seventy-seven million, four hundred seventy-eight thousand, four hundred eighty-two".