21750570746 has 16 divisors (see below), whose sum is σ = 34579180584. Its totient is φ = 10225442304.

The previous prime is 21750570689. The next prime is 21750570767. The reversal of 21750570746 is 64707505712.

It can be written as a sum of positive squares in 4 ways, for example, as 10612090225 + 11138480521 = 103015^2 + 105539^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21750570697 and 21750570706.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281315 + ... + 350198.

Almost surely, 2^21750570746 is an apocalyptic number.

21750570746 is a deficient number, since it is larger than the sum of its proper divisors (12828609838).

21750570746 is a wasteful number, since it uses less digits than its factorization.

21750570746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632545.

The product of its (nonzero) digits is 411600, while the sum is 44.

The spelling of 21750570746 in words is "twenty-one billion, seven hundred fifty million, five hundred seventy thousand, seven hundred forty-six".