102010221221 has 2 divisors, whose sum is σ = 102010221222. Its totient is φ = 102010221220.

The previous prime is 102010221197. The next prime is 102010221227. The reversal of 102010221221 is 122122010201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61695604996 + 40314616225 = 248386^2 + 200785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102010221221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102010221196 and 102010221205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102010221227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51005110610 + 51005110611.

It is an arithmetic number, because the mean of its divisors is an integer number (51005110611).

Almost surely, 2^102010221221 is an apocalyptic number.

It is an amenable number.

102010221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102010221221 is an equidigital number, since it uses as much as digits as its factorization.

102010221221 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 102010221221 its reverse (122122010201), we get a palindrome (224132231422).

The spelling of 102010221221 in words is "one hundred two billion, ten million, two hundred twenty-one thousand, two hundred twenty-one".