21020268466 has 16 divisors (see below), whose sum is σ = 31721261400. Its totient is φ = 10446547968.

The previous prime is 21020268463. The next prime is 21020268497. The reversal of 21020268466 is 66486202012.

It can be written as a sum of positive squares in 4 ways, for example, as 16790717241 + 4229551225 = 129579^2 + 65035^2 .

It is not an unprimeable number, because it can be changed into a prime (21020268463) 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, 1921420 + ... + 1932328.

Almost surely, 2^21020268466 is an apocalyptic number.

21020268466 is a deficient number, since it is larger than the sum of its proper divisors (10700992934).

21020268466 is a wasteful number, since it uses less digits than its factorization.

21020268466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16653.

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 21020268466 in words is "twenty-one billion, twenty million, two hundred sixty-eight thousand, four hundred sixty-six".