20021202000221 has 2 divisors, whose sum is σ = 20021202000222. Its totient is φ = 20021202000220.

The previous prime is 20021202000193. The next prime is 20021202000277. The reversal of 20021202000221 is 12200020212002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13725172562500 + 6296029437721 = 3704750^2 + 2509189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021202000221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021202000196 and 20021202000205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021202000721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010601000110 + 10010601000111.

It is an arithmetic number, because the mean of its divisors is an integer number (10010601000111).

Almost surely, 2^{20021202000221} is an apocalyptic number.

It is an amenable number.

20021202000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021202000221 is an equidigital number, since it uses as much as digits as its factorization.

20021202000221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20021202000221 its reverse (12200020212002), we get a palindrome (32221222212223).

The spelling of 20021202000221 in words is "twenty trillion, twenty-one billion, two hundred two million, two hundred twenty-one", and thus it is an aban number.