21152241 has 12 divisors (see below), whose sum is σ = 33330960. Its totient is φ = 12819480.

The previous prime is 21152239. The next prime is 21152291. The reversal of 21152241 is 14225112.

It is not a de Polignac number, because 21152241 - 2¹ = 21152239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21152291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106731 + ... + 106928.

It is an arithmetic number, because the mean of its divisors is an integer number (2777580).

Almost surely, 2^21152241 is an apocalyptic number.

It is an amenable number.

21152241 is a deficient number, since it is larger than the sum of its proper divisors (12178719).

21152241 is a wasteful number, since it uses less digits than its factorization.

21152241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213676 (or 213673 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 21152241 is about 4599.1565531084. The cubic root of 21152241 is about 276.5575135939.

Adding to 21152241 its reverse (14225112), we get a palindrome (35377353).

It can be divided in two parts, 2115 and 2241, that added together give a square (4356 = 66²).

The spelling of 21152241 in words is "twenty-one million, one hundred fifty-two thousand, two hundred forty-one".