213456205247 has 4 divisors (see below), whose sum is σ = 216027966840. Its totient is φ = 210884443656.

The previous prime is 213456205241. The next prime is 213456205297. The reversal of 213456205247 is 742502654312.

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 213456205247 - 2²⁰ = 213455156671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213456205241) 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, 1285880672 + ... + 1285880837.

It is an arithmetic number, because the mean of its divisors is an integer number (54006991710).

Almost surely, 2^213456205247 is an apocalyptic number.

213456205247 is a deficient number, since it is larger than the sum of its proper divisors (2571761593).

213456205247 is an equidigital number, since it uses as much as digits as its factorization.

213456205247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571761592.

The product of its (nonzero) digits is 403200, while the sum is 41.

Adding to 213456205247 its reverse (742502654312), we get a palindrome (955958859559).

The spelling of 213456205247 in words is "two hundred thirteen billion, four hundred fifty-six million, two hundred five thousand, two hundred forty-seven".