21415148 has 12 divisors (see below), whose sum is σ = 38091312. Its totient is φ = 10531920.

The previous prime is 21415133. The next prime is 21415153. The reversal of 21415148 is 84151412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43640 + ... + 44127.

It is an arithmetic number, because the mean of its divisors is an integer number (3174276).

Almost surely, 2^21415148 is an apocalyptic number.

It is an amenable number.

21415148 is a deficient number, since it is larger than the sum of its proper divisors (16676164).

21415148 is a wasteful number, since it uses less digits than its factorization.

21415148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87832 (or 87830 counting only the distinct ones).

The product of its digits is 1280, while the sum is 26.

The square root of 21415148 is about 4627.6503757306. The cubic root of 21415148 is about 277.6986019796.

The spelling of 21415148 in words is "twenty-one million, four hundred fifteen thousand, one hundred forty-eight".