21112057315 has 4 divisors (see below), whose sum is σ = 25334468784. Its totient is φ = 16889645848.

The previous prime is 21112057273. The next prime is 21112057319. The reversal of 21112057315 is 51375021112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21112057315 - 2¹¹ = 21112055267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112057319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2111205727 + ... + 2111205736.

It is an arithmetic number, because the mean of its divisors is an integer number (6333617196).

Almost surely, 2^21112057315 is an apocalyptic number.

21112057315 is a deficient number, since it is larger than the sum of its proper divisors (4222411469).

21112057315 is an equidigital number, since it uses as much as digits as its factorization.

21112057315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4222411468.

The product of its (nonzero) digits is 2100, while the sum is 28.

Adding to 21112057315 its reverse (51375021112), we get a palindrome (72487078427).

The spelling of 21112057315 in words is "twenty-one billion, one hundred twelve million, fifty-seven thousand, three hundred fifteen".