21052341 has 12 divisors (see below), whose sum is σ = 32197932. Its totient is φ = 13209216.

The previous prime is 21052333. The next prime is 21052349. The reversal of 21052341 is 14325012.

It is an interprime number because it is at equal distance from previous prime (21052333) and next prime (21052349).

It can be written as a sum of positive squares in 2 ways, for example, as 13351716 + 7700625 = 3654^2 + 2775^2 .

It is not a de Polignac number, because 21052341 - 2³ = 21052333 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68646 + ... + 68951.

It is an arithmetic number, because the mean of its divisors is an integer number (2683161).

Almost surely, 2^21052341 is an apocalyptic number.

It is an amenable number.

21052341 is a deficient number, since it is larger than the sum of its proper divisors (11145591).

21052341 is a wasteful number, since it uses less digits than its factorization.

21052341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137620 (or 137617 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21052341 is about 4588.2830121953. The cubic root of 21052341 is about 276.1214415163.

Adding to 21052341 its reverse (14325012), we get a palindrome (35377353).

The spelling of 21052341 in words is "twenty-one million, fifty-two thousand, three hundred forty-one".