21041356 has 24 divisors (see below), whose sum is σ = 43535520. Its totient is φ = 8706432.

The previous prime is 21041353. The next prime is 21041357. The reversal of 21041356 is 65314012.

It is not an unprimeable number, because it can be changed into a prime (21041353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12145 + ... + 13768.

It is an arithmetic number, because the mean of its divisors is an integer number (1813980).

Almost surely, 2^21041356 is an apocalyptic number.

It is an amenable number.

21041356 is an abundant number, since it is smaller than the sum of its proper divisors (22494164).

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

21041356 is a wasteful number, since it uses less digits than its factorization.

21041356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25953 (or 25951 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21041356 is about 4587.0857851146. The cubic root of 21041356 is about 276.0734069255.

Adding to 21041356 its reverse (65314012), we get a palindrome (86355368).

The spelling of 21041356 in words is "twenty-one million, forty-one thousand, three hundred fifty-six".