102120111021 has 16 divisors (see below), whose sum is σ = 142101498240. Its totient is φ = 65110288320.

The previous prime is 102120111011. The next prime is 102120111151. The reversal of 102120111021 is 120111021201.

It is not a de Polignac number, because 102120111021 - 2¹¹ = 102120108973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102120110988 and 102120111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102120111011) 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 15 ways as a sum of consecutive naturals, for example, 366231 + ... + 581691.

It is an arithmetic number, because the mean of its divisors is an integer number (8881343640).

Almost surely, 2^102120111021 is an apocalyptic number.

It is an amenable number.

102120111021 is a deficient number, since it is larger than the sum of its proper divisors (39981387219).

102120111021 is a wasteful number, since it uses less digits than its factorization.

102120111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222356.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 102120111021 its reverse (120111021201), we get a palindrome (222231132222).

The spelling of 102120111021 in words is "one hundred two billion, one hundred twenty million, one hundred eleven thousand, twenty-one".