2100202001021 has 2 divisors, whose sum is σ = 2100202001022. Its totient is φ = 2100202001020.

The previous prime is 2100202000951. The next prime is 2100202001033. The reversal of 2100202001021 is 1201002020012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1533510722500 + 566691278521 = 1238350^2 + 752789^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100202001021 - 2²⁶ = 2100134892157 is a prime.

It is a super-2 number, since 2×2100202001021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2100202000993 and 2100202001011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100202001921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050101000510 + 1050101000511.

It is an arithmetic number, because the mean of its divisors is an integer number (1050101000511).

Almost surely, 2^{2100202001021} is an apocalyptic number.

It is an amenable number.

2100202001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100202001021 is an equidigital number, since it uses as much as digits as its factorization.

2100202001021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2100202001021 its reverse (1201002020012), we get a palindrome (3301204021033).

The spelling of 2100202001021 in words is "two trillion, one hundred billion, two hundred two million, one thousand, twenty-one".