21221848 has 48 divisors (see below), whose sum is σ = 43213320. Its totient is φ = 9765888.

The previous prime is 21221843. The next prime is 21221867. The reversal of 21221848 is 84812212.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154836 + ... + 154972.

Almost surely, 2^21221848 is an apocalyptic number.

It is an amenable number.

21221848 is an abundant number, since it is smaller than the sum of its proper divisors (21991472).

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

21221848 is a wasteful number, since it uses less digits than its factorization.

21221848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 223 counting only the distinct ones).

The product of its digits is 2048, while the sum is 28.

The square root of 21221848 is about 4606.7177035282. The cubic root of 21221848 is about 276.8605431290.

The spelling of 21221848 in words is "twenty-one million, two hundred twenty-one thousand, eight hundred forty-eight".