21125410315 has 32 divisors (see below), whose sum is σ = 27008614080. Its totient is φ = 15807627264.

The previous prime is 21125410309. The next prime is 21125410331. The reversal of 21125410315 is 51301452112.

It is a cyclic number.

It is not a de Polignac number, because 21125410315 - 2⁵ = 21125410283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21125410315.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10410721 + ... + 10412749.

It is an arithmetic number, because the mean of its divisors is an integer number (844019190).

Almost surely, 2^21125410315 is an apocalyptic number.

21125410315 is a deficient number, since it is larger than the sum of its proper divisors (5883203765).

21125410315 is a wasteful number, since it uses less digits than its factorization.

21125410315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2751.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 21125410315 its reverse (51301452112), we get a palindrome (72426862427).

The spelling of 21125410315 in words is "twenty-one billion, one hundred twenty-five million, four hundred ten thousand, three hundred fifteen".