21020202010601 has 2 divisors, whose sum is σ = 21020202010602. Its totient is φ = 21020202010600.

The previous prime is 21020202010541. The next prime is 21020202010637. The reversal of 21020202010601 is 10601020202012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14269324930576 + 6750877080025 = 3777476^2 + 2598245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020202010601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21020202010601.

It is not a weakly prime, because it can be changed into another prime (21020202019601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510101005300 + 10510101005301.

It is an arithmetic number, because the mean of its divisors is an integer number (10510101005301).

Almost surely, 2^{21020202010601} is an apocalyptic number.

It is an amenable number.

21020202010601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020202010601 is an equidigital number, since it uses as much as digits as its factorization.

21020202010601 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21020202010601 its reverse (10601020202012), we get a palindrome (31621222212613).

The spelling of 21020202010601 in words is "twenty-one trillion, twenty billion, two hundred two million, ten thousand, six hundred one".