102011221121 has 4 divisors (see below), whose sum is σ = 102012304644. Its totient is φ = 102010137600.

The previous prime is 102011221099. The next prime is 102011221163. The reversal of 102011221121 is 121122110201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18165648400 + 83845572721 = 134780^2 + 289561^2 .

It is a cyclic number.

It is not a de Polignac number, because 102011221121 - 2⁶ = 102011221057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102011221096 and 102011221105.

It is not an unprimeable number, because it can be changed into a prime (102011221721) 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, 385520 + ... + 593841.

It is an arithmetic number, because the mean of its divisors is an integer number (25503076161).

Almost surely, 2^102011221121 is an apocalyptic number.

It is an amenable number.

102011221121 is a deficient number, since it is larger than the sum of its proper divisors (1083523).

102011221121 is an equidigital number, since it uses as much as digits as its factorization.

102011221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083522.

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

Adding to 102011221121 its reverse (121122110201), we get a palindrome (223133331322).

The spelling of 102011221121 in words is "one hundred two billion, eleven million, two hundred twenty-one thousand, one hundred twenty-one".