21863228 has 12 divisors (see below), whose sum is σ = 38324832. Its totient is φ = 10913280.

The previous prime is 21863227. The next prime is 21863267. The reversal of 21863228 is 82236812.

It is a junction number, because it is equal to n+sod(n) for n = 21863194 and 21863203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21863227) 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, 1700 + ... + 6827.

It is an arithmetic number, because the mean of its divisors is an integer number (3193736).

Almost surely, 2^21863228 is an apocalyptic number.

It is an amenable number.

21863228 is a deficient number, since it is larger than the sum of its proper divisors (16461604).

21863228 is a wasteful number, since it uses less digits than its factorization.

21863228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9172 (or 9170 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 21863228 is about 4675.8130843737. The cubic root of 21863228 is about 279.6220581136.

The spelling of 21863228 in words is "twenty-one million, eight hundred sixty-three thousand, two hundred twenty-eight".