102121021112021 has 2 divisors, whose sum is σ = 102121021112022. Its totient is φ = 102121021112020.

The previous prime is 102121021111937. The next prime is 102121021112023. The reversal of 102121021112021 is 120211120121201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99742066539025 + 2378954572996 = 9987095^2 + 1542386^2 .

It is a cyclic number.

It is not a de Polignac number, because 102121021112021 - 2³⁰ = 102119947370197 is a prime.

Together with 102121021112023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102121021112023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060510556010 + 51060510556011.

It is an arithmetic number, because the mean of its divisors is an integer number (51060510556011).

Almost surely, 2^{102121021112021} is an apocalyptic number.

It is an amenable number.

102121021112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102121021112021 is an equidigital number, since it uses as much as digits as its factorization.

102121021112021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 102121021112021 its reverse (120211120121201), we get a palindrome (222332141233222).

The spelling of 102121021112021 in words is "one hundred two trillion, one hundred twenty-one billion, twenty-one million, one hundred twelve thousand, twenty-one".