21842712 has 24 divisors (see below), whose sum is σ = 59157540. Its totient is φ = 7280880.

The previous prime is 21842699. The next prime is 21842719. The reversal of 21842712 is 21724812.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21842719) 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 5 ways as a sum of consecutive naturals, for example, 151614 + ... + 151757.

Almost surely, 2^21842712 is an apocalyptic number.

It is an amenable number.

21842712 is an abundant number, since it is smaller than the sum of its proper divisors (37314828).

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

21842712 is a wasteful number, since it uses less digits than its factorization.

21842712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303383 (or 303376 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 21842712 is about 4673.6187264260. The cubic root of 21842712 is about 279.5345668934.

The spelling of 21842712 in words is "twenty-one million, eight hundred forty-two thousand, seven hundred twelve".