21085827477176 has 32 divisors (see below), whose sum is σ = 49291544753280. Its totient is φ = 8215257458400.

The previous prime is 21085827477133. The next prime is 21085827477179. The reversal of 21085827477176 is 67177472858012.

It is a super-2 number, since 2×21085827477176² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21085827477179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17115119090 + ... + 17115120321.

It is an arithmetic number, because the mean of its divisors is an integer number (1540360773540).

Almost surely, 2^{21085827477176} is an apocalyptic number.

It is an amenable number.

21085827477176 is an abundant number, since it is smaller than the sum of its proper divisors (28205717276104).

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

21085827477176 is a wasteful number, since it uses less digits than its factorization.

21085827477176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34230239435 (or 34230239431 counting only the distinct ones).

The product of its (nonzero) digits is 73758720, while the sum is 65.

The spelling of 21085827477176 in words is "twenty-one trillion, eighty-five billion, eight hundred twenty-seven million, four hundred seventy-seven thousand, one hundred seventy-six".