21241152 has 42 divisors (see below), whose sum is σ = 60885578. Its totient is φ = 7080192.

The previous prime is 21241147. The next prime is 21241153. The reversal of 21241152 is 25114212.

It can be written as a sum of positive squares in only one way, i.e., 20575296 + 665856 = 4536^2 + 816^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241153) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17863 + ... + 19014.

Almost surely, 2^21241152 is an apocalyptic number.

It is an amenable number.

21241152 is an abundant number, since it is smaller than the sum of its proper divisors (39644426).

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

21241152 is a wasteful number, since it uses less digits than its factorization.

21241152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36895 (or 36882 counting only the distinct ones).

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

The square root of 21241152 is about 4608.8124283811. The cubic root of 21241152 is about 276.9444644450.

Adding to 21241152 its reverse (25114212), we get a palindrome (46355364).

The spelling of 21241152 in words is "twenty-one million, two hundred forty-one thousand, one hundred fifty-two".