102220121021 has 2 divisors, whose sum is σ = 102220121022. Its totient is φ = 102220121020.

The previous prime is 102220120999. The next prime is 102220121051. The reversal of 102220121021 is 120121022201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102137128921 + 82992100 = 319589^2 + 9110^2 .

It is an emirp because it is prime and its reverse (120121022201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102220121021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 102220120987 and 102220121005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102220121051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51110060510 + 51110060511.

It is an arithmetic number, because the mean of its divisors is an integer number (51110060511).

Almost surely, 2^102220121021 is an apocalyptic number.

It is an amenable number.

102220121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102220121021 is an equidigital number, since it uses as much as digits as its factorization.

102220121021 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 14.

Adding to 102220121021 its reverse (120121022201), we get a palindrome (222341143222).

The spelling of 102220121021 in words is "one hundred two billion, two hundred twenty million, one hundred twenty-one thousand, twenty-one".