102120010121 has 2 divisors, whose sum is σ = 102120010122. Its totient is φ = 102120010120.

The previous prime is 102120010117. The next prime is 102120010129. The reversal of 102120010121 is 121010021201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89018689600 + 13101320521 = 298360^2 + 114461^2 .

It is a cyclic number.

It is not a de Polignac number, because 102120010121 - 2² = 102120010117 is a prime.

It is a super-2 number, since 2×102120010121² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (102120010129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060005060 + 51060005061.

It is an arithmetic number, because the mean of its divisors is an integer number (51060005061).

Almost surely, 2^102120010121 is an apocalyptic number.

It is an amenable number.

102120010121 is a deficient number, since it is larger than the sum of its proper divisors (1).

102120010121 is an equidigital number, since it uses as much as digits as its factorization.

102120010121 is an evil number, because the sum of its binary digits is even.

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

Adding to 102120010121 its reverse (121010021201), we get a palindrome (223130031322).

The spelling of 102120010121 in words is "one hundred two billion, one hundred twenty million, ten thousand, one hundred twenty-one".