21315152 has 20 divisors (see below), whose sum is σ = 41393556. Its totient is φ = 10632960.

The previous prime is 21315139. The next prime is 21315163. The reversal of 21315152 is 25151312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7595536 + 13719616 = 2756^2 + 3704^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7058 + ... + 9614.

Almost surely, 2^21315152 is an apocalyptic number.

It is an amenable number.

21315152 is a deficient number, since it is larger than the sum of its proper divisors (20078404).

21315152 is a wasteful number, since it uses less digits than its factorization.

21315152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3086 (or 3080 counting only the distinct ones).

The product of its digits is 300, while the sum is 20.

The square root of 21315152 is about 4616.8335469237. The cubic root of 21315152 is about 277.2656983942.

Adding to 21315152 its reverse (25151312), we get a palindrome (46466464).

The spelling of 21315152 in words is "twenty-one million, three hundred fifteen thousand, one hundred fifty-two".