102020201201221 has 2 divisors, whose sum is σ = 102020201201222. Its totient is φ = 102020201201220.

The previous prime is 102020201201143. The next prime is 102020201201227. The reversal of 102020201201221 is 122102102020201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101579286609025 + 440914592196 = 10078655^2 + 664014^2 .

It is a cyclic number.

It is not a de Polignac number, because 102020201201221 - 2¹⁷ = 102020201070149 is a prime.

It is a super-2 number, since 2×102020201201221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 102020201201195 and 102020201201204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102020201201227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010100600610 + 51010100600611.

It is an arithmetic number, because the mean of its divisors is an integer number (51010100600611).

Almost surely, 2^{102020201201221} is an apocalyptic number.

It is an amenable number.

102020201201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102020201201221 is an equidigital number, since it uses as much as digits as its factorization.

102020201201221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 102020201201221 its reverse (122102102020201), we get a palindrome (224122303221422).

The spelling of 102020201201221 in words is "one hundred two trillion, twenty billion, two hundred one million, two hundred one thousand, two hundred twenty-one".