21786268712 has 32 divisors (see below), whose sum is σ = 44000251680. Its totient is φ = 10053201600.

The previous prime is 21786268711. The next prime is 21786268717.

21786268712 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (21786268711) 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, 590603 + ... + 626405.

It is an arithmetic number, because the mean of its divisors is an integer number (1375007865).

Almost surely, 2^21786268712 is an apocalyptic number.

It is an amenable number.

21786268712 is an abundant number, since it is smaller than the sum of its proper divisors (22213982968).

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

21786268712 is a wasteful number, since it uses less digits than its factorization.

21786268712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41673 (or 41669 counting only the distinct ones).

The product of its digits is 903168, while the sum is 50.

The spelling of 21786268712 in words is "twenty-one billion, seven hundred eighty-six million, two hundred sixty-eight thousand, seven hundred twelve".