21152084 has 12 divisors (see below), whose sum is σ = 37118004. Its totient is φ = 10546944.

The previous prime is 21152077. The next prime is 21152093. The reversal of 21152084 is 48025112.

It can be written as a sum of positive squares in 2 ways, for example, as 17875984 + 3276100 = 4228^2 + 1810^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5597 + ... + 8580.

It is an arithmetic number, because the mean of its divisors is an integer number (3093167).

Almost surely, 2^21152084 is an apocalyptic number.

It is an amenable number.

21152084 is a deficient number, since it is larger than the sum of its proper divisors (15965920).

21152084 is a wasteful number, since it uses less digits than its factorization.

21152084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14554 (or 14552 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 21152084 is about 4599.1394847297. The cubic root of 21152084 is about 276.5568293538.

Adding to 21152084 its reverse (48025112), we get a palindrome (69177196).

The spelling of 21152084 in words is "twenty-one million, one hundred fifty-two thousand, eighty-four".