2100021202021 has 2 divisors, whose sum is σ = 2100021202022. Its totient is φ = 2100021202020.

The previous prime is 2100021202007. The next prime is 2100021202043. The reversal of 2100021202021 is 1202021200012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1278288016996 + 821733185025 = 1130614^2 + 906495^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100021202021 - 2⁷ = 2100021201893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100021201992 and 2100021202010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100021232021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050010601010 + 1050010601011.

It is an arithmetic number, because the mean of its divisors is an integer number (1050010601011).

Almost surely, 2^{2100021202021} is an apocalyptic number.

It is an amenable number.

2100021202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100021202021 is an equidigital number, since it uses as much as digits as its factorization.

2100021202021 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 13.

Adding to 2100021202021 its reverse (1202021200012), we get a palindrome (3302042402033).

The spelling of 2100021202021 in words is "two trillion, one hundred billion, twenty-one million, two hundred two thousand, twenty-one".