21861712 has 20 divisors (see below), whose sum is σ = 42445696. Its totient is φ = 10908000.

The previous prime is 21861701. The next prime is 21861713. The reversal of 21861712 is 21716812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21861713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8587 + ... + 10837.

Almost surely, 2^21861712 is an apocalyptic number.

It is an amenable number.

21861712 is a deficient number, since it is larger than the sum of its proper divisors (20583984).

21861712 is a wasteful number, since it uses less digits than its factorization.

21861712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866 (or 2860 counting only the distinct ones).

The product of its digits is 1344, while the sum is 28.

The square root of 21861712 is about 4675.6509707205. The cubic root of 21861712 is about 279.6155949503.

The spelling of 21861712 in words is "twenty-one million, eight hundred sixty-one thousand, seven hundred twelve".