21675838370 has 16 divisors (see below), whose sum is σ = 39020565240. Its totient is φ = 8669433984.

The previous prime is 21675838367. The next prime is 21675838391. The reversal of 21675838370 is 7383857612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7834551169 + 13841287201 = 88513^2 + 117649^2 .

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, 6947 + ... + 208326.

Almost surely, 2^21675838370 is an apocalyptic number.

21675838370 is a deficient number, since it is larger than the sum of its proper divisors (17344726870).

21675838370 is a wasteful number, since it uses less digits than its factorization.

21675838370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225349.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 21675838370 in words is "twenty-one billion, six hundred seventy-five million, eight hundred thirty-eight thousand, three hundred seventy".