213255553261 has 4 divisors (see below), whose sum is σ = 213273762400. Its totient is φ = 213237344124.

The previous prime is 213255553201. The next prime is 213255553289. The reversal of 213255553261 is 162355552312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213255553261 - 2¹⁵ = 213255520493 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 (213255553201) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9086991 + ... + 9110428.

It is an arithmetic number, because the mean of its divisors is an integer number (53318440600).

Almost surely, 2^213255553261 is an apocalyptic number.

It is an amenable number.

213255553261 is a deficient number, since it is larger than the sum of its proper divisors (18209139).

213255553261 is a wasteful number, since it uses less digits than its factorization.

213255553261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18209138.

The product of its digits is 270000, while the sum is 40.

The spelling of 213255553261 in words is "two hundred thirteen billion, two hundred fifty-five million, five hundred fifty-three thousand, two hundred sixty-one".