102011211989 has 2 divisors, whose sum is σ = 102011211990. Its totient is φ = 102011211988.

The previous prime is 102011211979. The next prime is 102011212031. The reversal of 102011211989 is 989112110201.

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., 53057436964 + 48953775025 = 230342^2 + 221255^2 .

It is a cyclic number.

It is not a de Polignac number, because 102011211989 - 2¹⁶ = 102011146453 is a prime.

It is a super-2 number, since 2×102011211989² (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 (102011211949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51005605994 + 51005605995.

It is an arithmetic number, because the mean of its divisors is an integer number (51005605995).

Almost surely, 2^102011211989 is an apocalyptic number.

It is an amenable number.

102011211989 is a deficient number, since it is larger than the sum of its proper divisors (1).

102011211989 is an equidigital number, since it uses as much as digits as its factorization.

102011211989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 35.

The spelling of 102011211989 in words is "one hundred two billion, eleven million, two hundred eleven thousand, nine hundred eighty-nine".