102012210221 has 2 divisors, whose sum is σ = 102012210222. Its totient is φ = 102012210220.

The previous prime is 102012210217. The next prime is 102012210253. The reversal of 102012210221 is 122012210201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78598926025 + 23413284196 = 280355^2 + 153014^2 .

It is a cyclic number.

It is not a de Polignac number, because 102012210221 - 2² = 102012210217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102012210196 and 102012210205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102012210211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51006105110 + 51006105111.

It is an arithmetic number, because the mean of its divisors is an integer number (51006105111).

Almost surely, 2^102012210221 is an apocalyptic number.

It is an amenable number.

102012210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102012210221 is an equidigital number, since it uses as much as digits as its factorization.

102012210221 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 102012210221 its reverse (122012210201), we get a palindrome (224024420422).

The spelling of 102012210221 in words is "one hundred two billion, twelve million, two hundred ten thousand, two hundred twenty-one".