21402177712850 has 48 divisors (see below), whose sum is σ = 43427509032960. Its totient is φ = 7782512443200.

The previous prime is 21402177712849. The next prime is 21402177712889. The reversal of 21402177712850 is 5821777120412.

It is a junction number, because it is equal to n+sod(n) for n = 21402177712795 and 21402177712804.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 54989231 + ... + 55377069.

It is an arithmetic number, because the mean of its divisors is an integer number (904739771520).

Almost surely, 2^{21402177712850} is an apocalyptic number.

21402177712850 is an abundant number, since it is smaller than the sum of its proper divisors (22025331320110).

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

21402177712850 is a wasteful number, since it uses less digits than its factorization.

21402177712850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488195 (or 488190 counting only the distinct ones).

The product of its (nonzero) digits is 439040, while the sum is 47.

The spelling of 21402177712850 in words is "twenty-one trillion, four hundred two billion, one hundred seventy-seven million, seven hundred twelve thousand, eight hundred fifty".