21804804370 has 8 divisors (see below), whose sum is σ = 39248647884. Its totient is φ = 8721921744.

The previous prime is 21804804353. The next prime is 21804804407. The reversal of 21804804370 is 7340840812.

It can be written as a sum of positive squares in 2 ways, for example, as 21394620361 + 410184009 = 146269^2 + 20253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21804804370² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090240209 + ... + 1090240228.

Almost surely, 2^21804804370 is an apocalyptic number.

21804804370 is a deficient number, since it is larger than the sum of its proper divisors (17443843514).

21804804370 is a wasteful number, since it uses less digits than its factorization.

21804804370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180480444.

The product of its (nonzero) digits is 43008, while the sum is 37.

It can be divided in two parts, 2180 and 4804370, that added together give a triangular number (4806550 = T₃₁₀₀).

The spelling of 21804804370 in words is "twenty-one billion, eight hundred four million, eight hundred four thousand, three hundred seventy".