21041436 has 96 divisors (see below), whose sum is σ = 57702400. Its totient is φ = 5909760.

The previous prime is 21041429. The next prime is 21041437. The reversal of 21041436 is 63414012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91770 + ... + 91998.

Almost surely, 2^21041436 is an apocalyptic number.

21041436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21041436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28851200).

21041436 is an abundant number, since it is smaller than the sum of its proper divisors (36660964).

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

21041436 is a wasteful number, since it uses less digits than its factorization.

21041436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21041436 is about 4587.0945052397. The cubic root of 21041436 is about 276.0737568054.

Adding to 21041436 its reverse (63414012), we get a palindrome (84455448).

The spelling of 21041436 in words is "twenty-one million, forty-one thousand, four hundred thirty-six".