102221202121 has 4 divisors (see below), whose sum is σ = 102240593172. Its totient is φ = 102201811072.

The previous prime is 102221202119. The next prime is 102221202157. The reversal of 102221202121 is 121202122201.

It is a happy number.

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 24881592121 + 77339610000 = 157739^2 + 278100^2 .

It is a cyclic number.

It is not a de Polignac number, because 102221202121 - 2¹ = 102221202119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102221202095 and 102221202104.

It is not an unprimeable number, because it can be changed into a prime (102221202101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9687616 + ... + 9698161.

It is an arithmetic number, because the mean of its divisors is an integer number (25560148293).

Almost surely, 2^102221202121 is an apocalyptic number.

It is an amenable number.

102221202121 is a deficient number, since it is larger than the sum of its proper divisors (19391051).

102221202121 is an equidigital number, since it uses as much as digits as its factorization.

102221202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19391050.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 102221202121 its reverse (121202122201), we get a palindrome (223423324322).

The spelling of 102221202121 in words is "one hundred two billion, two hundred twenty-one million, two hundred two thousand, one hundred twenty-one".