21422148 has 24 divisors (see below), whose sum is σ = 54529440. Its totient is φ = 6491520.

The previous prime is 21422143. The next prime is 21422221. The reversal of 21422148 is 84122412.

It is not an unprimeable number, because it can be changed into a prime (21422143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81013 + ... + 81276.

It is an arithmetic number, because the mean of its divisors is an integer number (2272060).

Almost surely, 2^21422148 is an apocalyptic number.

It is an amenable number.

21422148 is an abundant number, since it is smaller than the sum of its proper divisors (33107292).

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

21422148 is a wasteful number, since it uses less digits than its factorization.

21422148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162307 (or 162305 counting only the distinct ones).

The product of its digits is 1024, while the sum is 24.

The square root of 21422148 is about 4628.4066372781. The cubic root of 21422148 is about 277.7288559296.

The spelling of 21422148 in words is "twenty-one million, four hundred twenty-two thousand, one hundred forty-eight".