211028520947 has 4 divisors (see below), whose sum is σ = 211029439920. Its totient is φ = 211027601976.

The previous prime is 211028520931. The next prime is 211028520991. The reversal of 211028520947 is 749025820112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 211028520947 - 2⁴ = 211028520931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211028523947) 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, 214829 + ... + 684257.

It is an arithmetic number, because the mean of its divisors is an integer number (52757359980).

Almost surely, 2^211028520947 is an apocalyptic number.

211028520947 is a deficient number, since it is larger than the sum of its proper divisors (918973).

211028520947 is an equidigital number, since it uses as much as digits as its factorization.

211028520947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918972.

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 211028520947 in words is "two hundred eleven billion, twenty-eight million, five hundred twenty thousand, nine hundred forty-seven".