102120212021 has 2 divisors, whose sum is σ = 102120212022. Its totient is φ = 102120212020.

The previous prime is 102120212017. The next prime is 102120212053. The reversal of 102120212021 is 120212021201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62557012996 + 39563199025 = 250114^2 + 198905^2 .

It is an emirp because it is prime and its reverse (120212021201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102120212021 - 2² = 102120212017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102120211987 and 102120212005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102120212081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060106010 + 51060106011.

It is an arithmetic number, because the mean of its divisors is an integer number (51060106011).

Almost surely, 2^102120212021 is an apocalyptic number.

It is an amenable number.

102120212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102120212021 is an equidigital number, since it uses as much as digits as its factorization.

102120212021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 102120212021 its reverse (120212021201), we get a palindrome (222332233222).

The spelling of 102120212021 in words is "one hundred two billion, one hundred twenty million, two hundred twelve thousand, twenty-one".