213122111989 has 2 divisors, whose sum is σ = 213122111990. Its totient is φ = 213122111988.

The previous prime is 213122111953. The next prime is 213122112001. The reversal of 213122111989 is 989111221312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151969767889 + 61152344100 = 389833^2 + 247290^2 .

It is a cyclic number.

It is not a de Polignac number, because 213122111989 - 2¹⁵ = 213122079221 is a prime.

It is a super-2 number, since 2×213122111989² (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 (213120111989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106561055994 + 106561055995.

It is an arithmetic number, because the mean of its divisors is an integer number (106561055995).

Almost surely, 2^213122111989 is an apocalyptic number.

It is an amenable number.

213122111989 is a deficient number, since it is larger than the sum of its proper divisors (1).

213122111989 is an equidigital number, since it uses as much as digits as its factorization.

213122111989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 40.

The spelling of 213122111989 in words is "two hundred thirteen billion, one hundred twenty-two million, one hundred eleven thousand, nine hundred eighty-nine".