21113025215 has 8 divisors (see below), whose sum is σ = 25765048080. Its totient is φ = 16604141632.

The previous prime is 21113025163. The next prime is 21113025229. The reversal of 21113025215 is 51252031112.

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 21113025215 - 2¹⁸ = 21112763071 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35784494 + ... + 35785083.

It is an arithmetic number, because the mean of its divisors is an integer number (3220631010).

Almost surely, 2^21113025215 is an apocalyptic number.

21113025215 is a deficient number, since it is larger than the sum of its proper divisors (4652022865).

21113025215 is an equidigital number, since it uses as much as digits as its factorization.

21113025215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71569641.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21113025215 its reverse (51252031112), we get a palindrome (72365056327).

The spelling of 21113025215 in words is "twenty-one billion, one hundred thirteen million, twenty-five thousand, two hundred fifteen".