21048612 has 72 divisors (see below), whose sum is σ = 54232416. Its totient is φ = 6349824.

The previous prime is 21048593. The next prime is 21048613. The reversal of 21048612 is 21684012.

It is not an unprimeable number, because it can be changed into a prime (21048613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196663 + ... + 196769.

It is an arithmetic number, because the mean of its divisors is an integer number (753228).

Almost surely, 2^21048612 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21048612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27116208).

21048612 is an abundant number, since it is smaller than the sum of its proper divisors (33183804).

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

21048612 is a wasteful number, since it uses less digits than its factorization.

21048612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21048612 is about 4587.8766330406. The cubic root of 21048612 is about 276.1051374284.

The spelling of 21048612 in words is "twenty-one million, forty-eight thousand, six hundred twelve".