102202021 has 2 divisors, whose sum is σ = 102202022. Its totient is φ = 102202020.

The previous prime is 102201991. The next prime is 102202031. The reversal of 102202021 is 120202201.

It is an a-pointer prime, because the next prime (102202031) can be obtained adding 102202021 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91872225 + 10329796 = 9585^2 + 3214^2 .

It is a cyclic number.

It is not a de Polignac number, because 102202021 - 2²³ = 93813413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102201989 and 102202007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102202031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51101010 + 51101011.

It is an arithmetic number, because the mean of its divisors is an integer number (51101011).

Almost surely, 2^102202021 is an apocalyptic number.

It is an amenable number.

102202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102202021 is an equidigital number, since it uses as much as digits as its factorization.

102202021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 102202021 is about 10109.5015208466. The cubic root of 102202021 is about 467.5411362470.

Adding to 102202021 its reverse (120202201), we get a palindrome (222404222).

The spelling of 102202021 in words is "one hundred two million, two hundred two thousand, twenty-one".