102111022121 has 4 divisors (see below), whose sum is σ = 108117552852. Its totient is φ = 96104491392.

The previous prime is 102111022103. The next prime is 102111022129. The reversal of 102111022121 is 121220111201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61764675625 + 40346346496 = 248525^2 + 200864^2 .

It is a de Polignac number, because none of the positive numbers 2^k-102111022121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102111022096 and 102111022105.

It is not an unprimeable number, because it can be changed into a prime (102111022129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3003265340 + ... + 3003265373.

It is an arithmetic number, because the mean of its divisors is an integer number (27029388213).

Almost surely, 2^102111022121 is an apocalyptic number.

It is an amenable number.

102111022121 is a deficient number, since it is larger than the sum of its proper divisors (6006530731).

102111022121 is an equidigital number, since it uses as much as digits as its factorization.

102111022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6006530730.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 102111022121 its reverse (121220111201), we get a palindrome (223331133322).

The spelling of 102111022121 in words is "one hundred two billion, one hundred eleven million, twenty-two thousand, one hundred twenty-one".