213156621361 has 4 divisors (see below), whose sum is σ = 217691868672. Its totient is φ = 208621374052.

The previous prime is 213156621329. The next prime is 213156621371. The reversal of 213156621361 is 163126651312.

213156621361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 213156621361 - 2⁵ = 213156621329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213156621361.

It is not an unprimeable number, because it can be changed into a prime (213156621371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2267623585 + ... + 2267623678.

It is an arithmetic number, because the mean of its divisors is an integer number (54422967168).

Almost surely, 2^213156621361 is an apocalyptic number.

It is an amenable number.

213156621361 is a deficient number, since it is larger than the sum of its proper divisors (4535247311).

213156621361 is an equidigital number, since it uses as much as digits as its factorization.

213156621361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4535247310.

The product of its digits is 38880, while the sum is 37.

The spelling of 213156621361 in words is "two hundred thirteen billion, one hundred fifty-six million, six hundred twenty-one thousand, three hundred sixty-one".