21493272766 has 8 divisors (see below), whose sum is σ = 36845610480. Its totient is φ = 9211402608.

The previous prime is 21493272763. The next prime is 21493272791. The reversal of 21493272766 is 66727239412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21493272761) 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, 767616871 + ... + 767616898.

It is an arithmetic number, because the mean of its divisors is an integer number (4605701310).

Almost surely, 2^21493272766 is an apocalyptic number.

21493272766 is a deficient number, since it is larger than the sum of its proper divisors (15352337714).

21493272766 is a wasteful number, since it uses less digits than its factorization.

21493272766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535233778.

The product of its digits is 1524096, while the sum is 49.

The spelling of 21493272766 in words is "twenty-one billion, four hundred ninety-three million, two hundred seventy-two thousand, seven hundred sixty-six".