21255466766 has 8 divisors (see below), whose sum is σ = 32198875704. Its totient is φ = 10522508200.

The previous prime is 21255466759. The next prime is 21255466777. The reversal of 21255466766 is 66766455212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52612340 + ... + 52612743.

It is an arithmetic number, because the mean of its divisors is an integer number (4024859463).

Almost surely, 2^21255466766 is an apocalyptic number.

21255466766 is a deficient number, since it is larger than the sum of its proper divisors (10943408938).

21255466766 is a wasteful number, since it uses less digits than its factorization.

21255466766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105225186.

The product of its digits is 3628800, while the sum is 50.

It can be divided in two parts, 2125546 and 6766, that added together give a palindrome (2132312).

The spelling of 21255466766 in words is "twenty-one billion, two hundred fifty-five million, four hundred sixty-six thousand, seven hundred sixty-six".