21074566266 has 24 divisors (see below), whose sum is σ = 49173988500. Its totient is φ = 6484481856.

The previous prime is 21074566207. The next prime is 21074566291. The reversal of 21074566266 is 66266547012.

21074566266 is a `hidden beast` number, since 2 + 10 + 7 + 4 + 5 + 6 + 626 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20903087241 + 171479025 = 144579^2 + 13095^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45030891 + ... + 45031358.

Almost surely, 2^21074566266 is an apocalyptic number.

21074566266 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21074566266 is an abundant number, since it is smaller than the sum of its proper divisors (28099422234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21074566266 is a wasteful number, since it uses less digits than its factorization.

21074566266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90062270 (or 90062267 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 21074566266 in words is "twenty-one billion, seventy-four million, five hundred sixty-six thousand, two hundred sixty-six".