21650563266 has 8 divisors (see below), whose sum is σ = 43301126544. Its totient is φ = 7216854420.

The previous prime is 21650563247. The next prime is 21650563267. The reversal of 21650563266 is 66236505612.

It is a sphenic number, since it is the product of 3 distinct primes.

21650563266 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21650563267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1804213600 + ... + 1804213611.

It is an arithmetic number, because the mean of its divisors is an integer number (5412640818).

Almost surely, 2^21650563266 is an apocalyptic number.

21650563266 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21650563266 is a wasteful number, since it uses less digits than its factorization.

21650563266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608427216.

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 21650563266 in words is "twenty-one billion, six hundred fifty million, five hundred sixty-three thousand, two hundred sixty-six".