2100101012021 has 2 divisors, whose sum is σ = 2100101012022. Its totient is φ = 2100101012020.

The previous prime is 2100101012011. The next prime is 2100101012039. The reversal of 2100101012021 is 1202101010012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1977890640625 + 122210371396 = 1406375^2 + 349586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100101012021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100101011993 and 2100101012011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100101012011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050050506010 + 1050050506011.

It is an arithmetic number, because the mean of its divisors is an integer number (1050050506011).

Almost surely, 2^{2100101012021} is an apocalyptic number.

It is an amenable number.

2100101012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100101012021 is an equidigital number, since it uses as much as digits as its factorization.

2100101012021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2100101012021 its reverse (1202101010012), we get a palindrome (3302202022033).

The spelling of 2100101012021 in words is "two trillion, one hundred billion, one hundred one million, twelve thousand, twenty-one".