21052112051 has 8 divisors (see below), whose sum is σ = 21617824704. Its totient is φ = 20493515520.

The previous prime is 21052112047. The next prime is 21052112063. The reversal of 21052112051 is 15021125012.

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 21052112051 - 2² = 21052112047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21052112021) 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, 1773035 + ... + 1784868.

It is an arithmetic number, because the mean of its divisors is an integer number (2702228088).

Almost surely, 2^21052112051 is an apocalyptic number.

21052112051 is a deficient number, since it is larger than the sum of its proper divisors (565712653).

21052112051 is an equidigital number, since it uses as much as digits as its factorization.

21052112051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3558061.

The product of its (nonzero) digits is 200, while the sum is 20.

Adding to 21052112051 its reverse (15021125012), we get a palindrome (36073237063).

The spelling of 21052112051 in words is "twenty-one billion, fifty-two million, one hundred twelve thousand, fifty-one".