21277885066 has 16 divisors (see below), whose sum is σ = 33797626056. Its totient is φ = 10012133376.

The previous prime is 21277885061. The next prime is 21277885067. The reversal of 21277885066 is 66058877212.

It can be written as a sum of positive squares in 4 ways, for example, as 21251516841 + 26368225 = 145779^2 + 5135^2 .

It is not an unprimeable number, because it can be changed into a prime (21277885061) 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, 409210 + ... + 458266.

Almost surely, 2^21277885066 is an apocalyptic number.

21277885066 is a deficient number, since it is larger than the sum of its proper divisors (12519740990).

21277885066 is a wasteful number, since it uses less digits than its factorization.

21277885066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61833.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 21277885066 in words is "twenty-one billion, two hundred seventy-seven million, eight hundred eighty-five thousand, sixty-six".