213122133109 has 2 divisors, whose sum is σ = 213122133110. Its totient is φ = 213122133108.

The previous prime is 213122132981. The next prime is 213122133143. The reversal of 213122133109 is 901331221312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212949946225 + 172186884 = 461465^2 + 13122^2 .

It is a cyclic number.

It is not a de Polignac number, because 213122133109 - 2⁷ = 213122132981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213122133199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106561066554 + 106561066555.

It is an arithmetic number, because the mean of its divisors is an integer number (106561066555).

Almost surely, 2^213122133109 is an apocalyptic number.

It is an amenable number.

213122133109 is a deficient number, since it is larger than the sum of its proper divisors (1).

213122133109 is an equidigital number, since it uses as much as digits as its factorization.

213122133109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 213122133109 in words is "two hundred thirteen billion, one hundred twenty-two million, one hundred thirty-three thousand, one hundred nine".