21550700266 has 16 divisors (see below), whose sum is σ = 32494204800. Its totient is φ = 10719390528.

The previous prime is 21550700261. The next prime is 21550700273. The reversal of 21550700266 is 66200705512.

It is not an unprimeable number, because it can be changed into a prime (21550700261) 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, 459961 + ... + 504643.

It is an arithmetic number, because the mean of its divisors is an integer number (2030887800).

Almost surely, 2^21550700266 is an apocalyptic number.

21550700266 is a deficient number, since it is larger than the sum of its proper divisors (10943504534).

21550700266 is a wasteful number, since it uses less digits than its factorization.

21550700266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45933.

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 21550700266 in words is "twenty-one billion, five hundred fifty million, seven hundred thousand, two hundred sixty-six".