2102020101221 has 2 divisors, whose sum is σ = 2102020101222. Its totient is φ = 2102020101220.

The previous prime is 2102020101197. The next prime is 2102020101239. The reversal of 2102020101221 is 1221010202012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1577822380996 + 524197720225 = 1256114^2 + 724015^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102020101221 - 2¹⁸ = 2102019839077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2102020101196 and 2102020101205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102020101421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051010050610 + 1051010050611.

It is an arithmetic number, because the mean of its divisors is an integer number (1051010050611).

Almost surely, 2^{2102020101221} is an apocalyptic number.

It is an amenable number.

2102020101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102020101221 is an equidigital number, since it uses as much as digits as its factorization.

2102020101221 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 2102020101221 its reverse (1221010202012), we get a palindrome (3323030303233).

The spelling of 2102020101221 in words is "two trillion, one hundred two billion, twenty million, one hundred one thousand, two hundred twenty-one".