21375148 has 6 divisors (see below), whose sum is σ = 37406516. Its totient is φ = 10687572.

The previous prime is 21375143. The next prime is 21375157. The reversal of 21375148 is 84157312.

It is not an unprimeable number, because it can be changed into a prime (21375143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2671890 + ... + 2671897.

Almost surely, 2^21375148 is an apocalyptic number.

It is an amenable number.

21375148 is a deficient number, since it is larger than the sum of its proper divisors (16031368).

21375148 is a wasteful number, since it uses less digits than its factorization.

21375148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5343791 (or 5343789 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 21375148 is about 4623.3265080459. The cubic root of 21375148 is about 277.5255956695.

The spelling of 21375148 in words is "twenty-one million, three hundred seventy-five thousand, one hundred forty-eight".