21152472415 has 8 divisors (see below), whose sum is σ = 25383888000. Its totient is φ = 16921363872.

The previous prime is 21152472413. The next prime is 21152472431. The reversal of 21152472415 is 51427425112.

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

It is a cyclic number.

It is not a de Polignac number, because 21152472415 - 2¹ = 21152472413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152472413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121237 + ... + 238753.

It is an arithmetic number, because the mean of its divisors is an integer number (3172986000).

Almost surely, 2^21152472415 is an apocalyptic number.

21152472415 is a deficient number, since it is larger than the sum of its proper divisors (4231415585).

21152472415 is a wasteful number, since it uses less digits than its factorization.

21152472415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153521.

The product of its digits is 22400, while the sum is 34.

Adding to 21152472415 its reverse (51427425112), we get a palindrome (72579897527).

The spelling of 21152472415 in words is "twenty-one billion, one hundred fifty-two million, four hundred seventy-two thousand, four hundred fifteen".