2101021022021 has 2 divisors, whose sum is σ = 2101021022022. Its totient is φ = 2101021022020.

The previous prime is 2101021022003. The next prime is 2101021022027. The reversal of 2101021022021 is 1202201201012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2089221631396 + 11799390625 = 1445414^2 + 108625^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101021022021 - 2³⁸ = 1826143115077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101021021987 and 2101021022005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101021022027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050510511010 + 1050510511011.

It is an arithmetic number, because the mean of its divisors is an integer number (1050510511011).

Almost surely, 2^{2101021022021} is an apocalyptic number.

It is an amenable number.

2101021022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101021022021 is an equidigital number, since it uses as much as digits as its factorization.

2101021022021 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 2101021022021 its reverse (1202201201012), we get a palindrome (3303222223033).

The spelling of 2101021022021 in words is "two trillion, one hundred one billion, twenty-one million, twenty-two thousand, twenty-one".