2100020212021 has 2 divisors, whose sum is σ = 2100020212022. Its totient is φ = 2100020212020.

The previous prime is 2100020212009. The next prime is 2100020212079. The reversal of 2100020212021 is 1202120200012.

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., 1873720207921 + 226300004100 = 1368839^2 + 475710^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100020212021 - 2⁷ = 2100020211893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100020211992 and 2100020212010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100020012021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050010106010 + 1050010106011.

It is an arithmetic number, because the mean of its divisors is an integer number (1050010106011).

Almost surely, 2^{2100020212021} is an apocalyptic number.

It is an amenable number.

2100020212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100020212021 is an equidigital number, since it uses as much as digits as its factorization.

2100020212021 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 13.

Adding to 2100020212021 its reverse (1202120200012), we get a palindrome (3302140412033).

The spelling of 2100020212021 in words is "two trillion, one hundred billion, twenty million, two hundred twelve thousand, twenty-one".