213221803813 has 2 divisors, whose sum is σ = 213221803814. Its totient is φ = 213221803812.

The previous prime is 213221803789. The next prime is 213221803829. The reversal of 213221803813 is 318308122312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129224432484 + 83997371329 = 359478^2 + 289823^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213221803813 is a prime.

It is a super-2 number, since 2×213221803813² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213221803013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106610901906 + 106610901907.

It is an arithmetic number, because the mean of its divisors is an integer number (106610901907).

Almost surely, 2^213221803813 is an apocalyptic number.

It is an amenable number.

213221803813 is a deficient number, since it is larger than the sum of its proper divisors (1).

213221803813 is an equidigital number, since it uses as much as digits as its factorization.

213221803813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 213221803813 in words is "two hundred thirteen billion, two hundred twenty-one million, eight hundred three thousand, eight hundred thirteen".