21418148 has 24 divisors (see below), whose sum is σ = 39432960. Its totient is φ = 10164960.

The previous prime is 21418139. The next prime is 21418151. The reversal of 21418148 is 84181412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21418148.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4943 + ... + 8201.

It is an arithmetic number, because the mean of its divisors is an integer number (1643040).

Almost surely, 2^21418148 is an apocalyptic number.

It is an amenable number.

21418148 is a deficient number, since it is larger than the sum of its proper divisors (18014812).

21418148 is a wasteful number, since it uses less digits than its factorization.

21418148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347 (or 3345 counting only the distinct ones).

The product of its digits is 2048, while the sum is 29.

The square root of 21418148 is about 4627.9745029548. The cubic root of 21418148 is about 277.7115687654.

The spelling of 21418148 in words is "twenty-one million, four hundred eighteen thousand, one hundred forty-eight".