102221022121 has 4 divisors (see below), whose sum is σ = 103896776644. Its totient is φ = 100545267600.

The previous prime is 102221022107. The next prime is 102221022133. The reversal of 102221022121 is 121220122201.

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 37562703721 + 64658318400 = 193811^2 + 254280^2 .

It is a cyclic number.

It is not a de Polignac number, because 102221022121 - 2¹¹ = 102221020073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102221022095 and 102221022104.

It is not an unprimeable number, because it can be changed into a prime (102221052121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837877170 + ... + 837877291.

It is an arithmetic number, because the mean of its divisors is an integer number (25974194161).

Almost surely, 2^102221022121 is an apocalyptic number.

It is an amenable number.

102221022121 is a deficient number, since it is larger than the sum of its proper divisors (1675754523).

102221022121 is an equidigital number, since it uses as much as digits as its factorization.

102221022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675754522.

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

Adding to 102221022121 its reverse (121220122201), we get a palindrome (223441144322).

The spelling of 102221022121 in words is "one hundred two billion, two hundred twenty-one million, twenty-two thousand, one hundred twenty-one".