102101020121 has 4 divisors (see below), whose sum is σ = 102101748132. Its totient is φ = 102100292112.

The previous prime is 102101020117. The next prime is 102101020123. The reversal of 102101020121 is 121020101201.

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 53980016896 + 48121003225 = 232336^2 + 219365^2 .

It is a cyclic number.

It is not a de Polignac number, because 102101020121 - 2² = 102101020117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102101020123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79526 + ... + 458831.

It is an arithmetic number, because the mean of its divisors is an integer number (25525437033).

Almost surely, 2^102101020121 is an apocalyptic number.

It is an amenable number.

102101020121 is a deficient number, since it is larger than the sum of its proper divisors (728011).

102101020121 is an equidigital number, since it uses as much as digits as its factorization.

102101020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728010.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 102101020121 its reverse (121020101201), we get a palindrome (223121121322).

The spelling of 102101020121 in words is "one hundred two billion, one hundred one million, twenty thousand, one hundred twenty-one".