21035228 has 6 divisors (see below), whose sum is σ = 36811656. Its totient is φ = 10517612.

The previous prime is 21035227. The next prime is 21035233. The reversal of 21035228 is 82253012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629400 + ... + 2629407.

It is an arithmetic number, because the mean of its divisors is an integer number (6135276).

Almost surely, 2^21035228 is an apocalyptic number.

It is an amenable number.

21035228 is a deficient number, since it is larger than the sum of its proper divisors (15776428).

21035228 is a wasteful number, since it uses less digits than its factorization.

21035228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5258811 (or 5258809 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21035228 is about 4586.4177742548. The cubic root of 21035228 is about 276.0466034866.

The spelling of 21035228 in words is "twenty-one million, thirty-five thousand, two hundred twenty-eight".