21443152 has 20 divisors (see below), whose sum is σ = 41643540. Its totient is φ = 10696448.

The previous prime is 21443141. The next prime is 21443159. The reversal of 21443152 is 25134412.

It can be written as a sum of positive squares in 2 ways, for example, as 10394176 + 11048976 = 3224^2 + 3324^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6828 + ... + 9460.

It is an arithmetic number, because the mean of its divisors is an integer number (2082177).

Almost surely, 2^21443152 is an apocalyptic number.

It is an amenable number.

21443152 is a deficient number, since it is larger than the sum of its proper divisors (20200388).

21443152 is a wasteful number, since it uses less digits than its factorization.

21443152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3150 (or 3144 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 21443152 is about 4630.6751127670. The cubic root of 21443152 is about 277.8195955295.

Adding to 21443152 its reverse (25134412), we get a palindrome (46577564).

The spelling of 21443152 in words is "twenty-one million, four hundred forty-three thousand, one hundred fifty-two".