21750250806 has 24 divisors (see below), whose sum is σ = 49897634904. Its totient is φ = 6823608000.

The previous prime is 21750250787. The next prime is 21750250807. The reversal of 21750250806 is 60805205712.

It is a happy number.

21750250806 is a `hidden beast` number, since 21 + 7 + 502 + 50 + 80 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21750250807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35539320 + ... + 35539931.

It is an arithmetic number, because the mean of its divisors is an integer number (2079068121).

Almost surely, 2^21750250806 is an apocalyptic number.

21750250806 is an abundant number, since it is smaller than the sum of its proper divisors (28147384098).

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

21750250806 is a wasteful number, since it uses less digits than its factorization.

21750250806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71079276 (or 71079273 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 21750250806 in words is "twenty-one billion, seven hundred fifty million, two hundred fifty thousand, eight hundred six".