102121022122121 has 4 divisors (see below), whose sum is σ = 102121043156244. Its totient is φ = 102121001088000.

The previous prime is 102121022122079. The next prime is 102121022122183. The reversal of 102121022122121 is 121221220121201.

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 46343485836025 + 55777536286096 = 6807605^2 + 7468436^2 .

It is a cyclic number.

It is not a de Polignac number, because 102121022122121 - 2¹⁸ = 102121021859977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102121022122093 and 102121022122102.

It is not an unprimeable number, because it can be changed into a prime (102121022172121) 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, 888521 + ... + 14318921.

It is an arithmetic number, because the mean of its divisors is an integer number (25530260789061).

Almost surely, 2^{102121022122121} is an apocalyptic number.

It is an amenable number.

102121022122121 is a deficient number, since it is larger than the sum of its proper divisors (21034123).

102121022122121 is an equidigital number, since it uses as much as digits as its factorization.

102121022122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21034122.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 102121022122121 its reverse (121221220121201), we get a palindrome (223342242243322).

The spelling of 102121022122121 in words is "one hundred two trillion, one hundred twenty-one billion, twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".