2100321011221 has 2 divisors, whose sum is σ = 2100321011222. Its totient is φ = 2100321011220.

The previous prime is 2100321011219. The next prime is 2100321011267. The reversal of 2100321011221 is 1221101230012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1344614180625 + 755706830596 = 1159575^2 + 869314^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100321011221 - 2¹ = 2100321011219 is a prime.

It is a super-2 number, since 2×2100321011221² (a number of 25 digits) contains 22 as substring.

Together with 2100321011219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2100321011195 and 2100321011204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100321012221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050160505610 + 1050160505611.

It is an arithmetic number, because the mean of its divisors is an integer number (1050160505611).

Almost surely, 2^{2100321011221} is an apocalyptic number.

It is an amenable number.

2100321011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100321011221 is an equidigital number, since it uses as much as digits as its factorization.

2100321011221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 2100321011221 its reverse (1221101230012), we get a palindrome (3321422241233).

The spelling of 2100321011221 in words is "two trillion, one hundred billion, three hundred twenty-one million, eleven thousand, two hundred twenty-one".