21823712 has 24 divisors (see below), whose sum is σ = 43164576. Its totient is φ = 10861312.

The previous prime is 21823693. The next prime is 21823717. The reversal of 21823712 is 21732812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21823717) 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, 5993 + ... + 8919.

It is an arithmetic number, because the mean of its divisors is an integer number (1798524).

Almost surely, 2^21823712 is an apocalyptic number.

It is an amenable number.

21823712 is a deficient number, since it is larger than the sum of its proper divisors (21340864).

21823712 is a wasteful number, since it uses less digits than its factorization.

21823712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170 (or 3162 counting only the distinct ones).

The product of its digits is 1344, while the sum is 26.

The square root of 21823712 is about 4671.5855980598. The cubic root of 21823712 is about 279.4534918344.

The spelling of 21823712 in words is "twenty-one million, eight hundred twenty-three thousand, seven hundred twelve".