21223148 has 12 divisors (see below), whose sum is σ = 37205952. Its totient is φ = 10592880.

The previous prime is 21223141. The next prime is 21223159. The reversal of 21223148 is 84132212.

It is a happy number.

It is a super-2 number, since 2×21223148² = 900844022059808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21223141) 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, 1943 + ... + 6798.

It is an arithmetic number, because the mean of its divisors is an integer number (3100496).

Almost surely, 2^21223148 is an apocalyptic number.

It is an amenable number.

21223148 is a deficient number, since it is larger than the sum of its proper divisors (15982804).

21223148 is a wasteful number, since it uses less digits than its factorization.

21223148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9352 (or 9350 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 21223148 is about 4606.8587996595. The cubic root of 21223148 is about 276.8661962867.

The spelling of 21223148 in words is "twenty-one million, two hundred twenty-three thousand, one hundred forty-eight".