102020011989 has 48 divisors (see below), whose sum is σ = 159214099968. Its totient is φ = 57937396608.

The previous prime is 102020011969. The next prime is 102020012089. The reversal of 102020011989 is 989110020201.

It is a de Polignac number, because none of the positive numbers 2^k-102020011989 is a prime.

It is a super-2 number, since 2×102020011989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102020011969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22190439 + ... + 22195035.

It is an arithmetic number, because the mean of its divisors is an integer number (3316960416).

Almost surely, 2^102020011989 is an apocalyptic number.

It is an amenable number.

102020011989 is a deficient number, since it is larger than the sum of its proper divisors (57194087979).

102020011989 is a wasteful number, since it uses less digits than its factorization.

102020011989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5514 (or 5507 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 33.

The spelling of 102020011989 in words is "one hundred two billion, twenty million, eleven thousand, nine hundred eighty-nine".