21041364 has 24 divisors (see below), whose sum is σ = 50295168. Its totient is φ = 6842560.

The previous prime is 21041357. The next prime is 21041369. The reversal of 21041364 is 46314012.

It is a self number, because there is not a number n which added to its sum of digits gives 21041364.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041369) 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, 20892 + ... + 21875.

It is an arithmetic number, because the mean of its divisors is an integer number (2095632).

Almost surely, 2^21041364 is an apocalyptic number.

It is an amenable number.

21041364 is an abundant number, since it is smaller than the sum of its proper divisors (29253804).

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

21041364 is a wasteful number, since it uses less digits than its factorization.

21041364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42815 (or 42813 counting only the distinct ones).

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

The square root of 21041364 is about 4587.0866571278. The cubic root of 21041364 is about 276.0734419135.

Adding to 21041364 its reverse (46314012), we get a palindrome (67355376).

The spelling of 21041364 in words is "twenty-one million, forty-one thousand, three hundred sixty-four".