211208129989 has 2 divisors, whose sum is σ = 211208129990. Its totient is φ = 211208129988.

The previous prime is 211208129981. The next prime is 211208130019. The reversal of 211208129989 is 989921802112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210849027489 + 359102500 = 459183^2 + 18950^2 .

It is a cyclic number.

It is not a de Polignac number, because 211208129989 - 2³ = 211208129981 is a prime.

It is a super-2 number, since 2×211208129989² (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 (211208129981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105604064994 + 105604064995.

It is an arithmetic number, because the mean of its divisors is an integer number (105604064995).

Almost surely, 2^211208129989 is an apocalyptic number.

It is an amenable number.

211208129989 is a deficient number, since it is larger than the sum of its proper divisors (1).

211208129989 is an equidigital number, since it uses as much as digits as its factorization.

211208129989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 52.

The spelling of 211208129989 in words is "two hundred eleven billion, two hundred eight million, one hundred twenty-nine thousand, nine hundred eighty-nine".