21823888 has 10 divisors (see below), whose sum is σ = 42283814. Its totient is φ = 10911936.

The previous prime is 21823883. The next prime is 21823889. The reversal of 21823888 is 88832812.

It can be written as a sum of positive squares in only one way, i.e., 19784704 + 2039184 = 4448^2 + 1428^2 .

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 21823888.

It is not an unprimeable number, because it can be changed into a prime (21823883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 681981 + ... + 682012.

Almost surely, 2^21823888 is an apocalyptic number.

It is an amenable number.

21823888 is a deficient number, since it is larger than the sum of its proper divisors (20459926).

21823888 is a wasteful number, since it uses less digits than its factorization.

21823888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364001 (or 1363995 counting only the distinct ones).

The product of its digits is 49152, while the sum is 40.

The square root of 21823888 is about 4671.6044353091. The cubic root of 21823888 is about 279.4542430613.

The spelling of 21823888 in words is "twenty-one million, eight hundred twenty-three thousand, eight hundred eighty-eight".