21152485 has 8 divisors (see below), whose sum is σ = 25583616. Its totient is φ = 16788240.

The previous prime is 21152477. The next prime is 21152507. The reversal of 21152485 is 58425112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21152485 - 2³ = 21152477 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 16021 + ... + 17290.

It is an arithmetic number, because the mean of its divisors is an integer number (3197952).

Almost surely, 2^21152485 is an apocalyptic number.

It is an amenable number.

21152485 is a deficient number, since it is larger than the sum of its proper divisors (4431131).

21152485 is a wasteful number, since it uses less digits than its factorization.

21152485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33443.

The product of its digits is 3200, while the sum is 28.

The square root of 21152485 is about 4599.1830796349. The cubic root of 21152485 is about 276.5585769922.

Adding to 21152485 its reverse (58425112), we get a palindrome (79577597).

The spelling of 21152485 in words is "twenty-one million, one hundred fifty-two thousand, four hundred eighty-five".