2100221021021 has 2 divisors, whose sum is σ = 2100221021022. Its totient is φ = 2100221021020.

The previous prime is 2100221020979. The next prime is 2100221021027. The reversal of 2100221021021 is 1201201220012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2071282248025 + 28938772996 = 1439195^2 + 170114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100221021021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100221020987 and 2100221021005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100221021027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050110510510 + 1050110510511.

It is an arithmetic number, because the mean of its divisors is an integer number (1050110510511).

Almost surely, 2^{2100221021021} is an apocalyptic number.

It is an amenable number.

2100221021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100221021021 is an equidigital number, since it uses as much as digits as its factorization.

2100221021021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2100221021021 its reverse (1201201220012), we get a palindrome (3301422241033).

The spelling of 2100221021021 in words is "two trillion, one hundred billion, two hundred twenty-one million, twenty-one thousand, twenty-one".