21350434806 has 24 divisors (see below), whose sum is σ = 46265975184. Its totient is φ = 7115780880.

The previous prime is 21350434801. The next prime is 21350434849. The reversal of 21350434806 is 60843405312.

21350434806 is a `hidden beast` number, since 2 + 135 + 0 + 43 + 480 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21350434801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47436 + ... + 212016.

It is an arithmetic number, because the mean of its divisors is an integer number (1927748966).

Almost surely, 2^21350434806 is an apocalyptic number.

21350434806 is an abundant number, since it is smaller than the sum of its proper divisors (24915540378).

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

21350434806 is a wasteful number, since it uses less digits than its factorization.

21350434806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171796 (or 171793 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 21350434806 in words is "twenty-one billion, three hundred fifty million, four hundred thirty-four thousand, eight hundred six".