21405376350 has 144 divisors (see below), whose sum is σ = 60284047824. Its totient is φ = 5439168000.

The previous prime is 21405376331. The next prime is 21405376381. The reversal of 21405376350 is 5367350412.

21405376350 is a `hidden beast` number, since 2 + 14 + 0 + 5 + 3 + 7 + 635 + 0 = 666.

It is a congruent number.

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 71 ways as a sum of consecutive naturals, for example, 779860 + ... + 806840.

It is an arithmetic number, because the mean of its divisors is an integer number (418639221).

Almost surely, 2^21405376350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21405376350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30142023912).

21405376350 is an abundant number, since it is smaller than the sum of its proper divisors (38878671474).

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

21405376350 is a wasteful number, since it uses less digits than its factorization.

21405376350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27083 (or 27075 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The spelling of 21405376350 in words is "twenty-one billion, four hundred five million, three hundred seventy-six thousand, three hundred fifty".