21248330 has 16 divisors (see below), whose sum is σ = 39481344. Its totient is φ = 8225040.

The previous prime is 21248309. The next prime is 21248363. The reversal of 21248330 is 3384212.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21248296 and 21248305.

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, 33962 + ... + 34581.

It is an arithmetic number, because the mean of its divisors is an integer number (2467584).

Almost surely, 2^21248330 is an apocalyptic number.

21248330 is a deficient number, since it is larger than the sum of its proper divisors (18233014).

21248330 is a wasteful number, since it uses less digits than its factorization.

21248330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68581.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21248330 is about 4609.5910881552. The cubic root of 21248330 is about 276.9756567815.

The spelling of 21248330 in words is "twenty-one million, two hundred forty-eight thousand, three hundred thirty".