21202248 has 64 divisors (see below), whose sum is σ = 56246400. Its totient is φ = 6648320.

The previous prime is 21202211. The next prime is 21202261. The reversal of 21202248 is 84220212.

Added to its reverse (84220212) it gives a triangular number (105422460 = T₁₄₅₂₀).

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28165 + ... + 28907.

It is an arithmetic number, because the mean of its divisors is an integer number (878850).

Almost surely, 2^21202248 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 21202248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28123200).

21202248 is an abundant number, since it is smaller than the sum of its proper divisors (35044152).

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

21202248 is a wasteful number, since it uses less digits than its factorization.

21202248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 21202248 is about 4604.5898840179. The cubic root of 21202248 is about 276.7752829122.

Adding to 21202248 its reverse (84220212), we get a triangular number (105422460 = T₁₄₅₂₀).

The spelling of 21202248 in words is "twenty-one million, two hundred two thousand, two hundred forty-eight".