21442712 has 16 divisors (see below), whose sum is σ = 42570360. Its totient is φ = 10090624.

The previous prime is 21442703. The next prime is 21442717. The reversal of 21442712 is 21724412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442717) 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, 78698 + ... + 78969.

Almost surely, 2^21442712 is an apocalyptic number.

It is an amenable number.

21442712 is a deficient number, since it is larger than the sum of its proper divisors (21127648).

21442712 is a wasteful number, since it uses less digits than its factorization.

21442712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157690 (or 157686 counting only the distinct ones).

The product of its digits is 896, while the sum is 23.

The square root of 21442712 is about 4630.6276032521. The cubic root of 21442712 is about 277.8176952886.

The spelling of 21442712 in words is "twenty-one million, four hundred forty-two thousand, seven hundred twelve".