21904389466 has 16 divisors (see below), whose sum is σ = 34807613544. Its totient is φ = 10302529024.

The previous prime is 21904389461. The next prime is 21904389467. The reversal of 21904389466 is 66498340912.

It can be written as a sum of positive squares in 4 ways, for example, as 20569583241 + 1334806225 = 143421^2 + 36535^2 .

It is not an unprimeable number, because it can be changed into a prime (21904389461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103345 + ... + 233428.

Almost surely, 2^21904389466 is an apocalyptic number.

21904389466 is a deficient number, since it is larger than the sum of its proper divisors (12903224078).

21904389466 is a wasteful number, since it uses less digits than its factorization.

21904389466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338705.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The spelling of 21904389466 in words is "twenty-one billion, nine hundred four million, three hundred eighty-nine thousand, four hundred sixty-six".