2102002061021 has 2 divisors, whose sum is σ = 2102002061022. Its totient is φ = 2102002061020.

The previous prime is 2102002060997. The next prime is 2102002061099. The reversal of 2102002061021 is 1201602002012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1167804422500 + 934197638521 = 1080650^2 + 966539^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102002061021 - 2³⁸ = 1827124154077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102002061821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051001030510 + 1051001030511.

It is an arithmetic number, because the mean of its divisors is an integer number (1051001030511).

Almost surely, 2^{2102002061021} is an apocalyptic number.

It is an amenable number.

2102002061021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102002061021 is an equidigital number, since it uses as much as digits as its factorization.

2102002061021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 2102002061021 its reverse (1201602002012), we get a palindrome (3303604063033).

The spelling of 2102002061021 in words is "two trillion, one hundred two billion, two million, sixty-one thousand, twenty-one".