20212202002121 has 2 divisors, whose sum is σ = 20212202002122. Its totient is φ = 20212202002120.

The previous prime is 20212202002081. The next prime is 20212202002211. The reversal of 20212202002121 is 12120020221202.

It is a happy number.

Together with next prime (20212202002211) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14484029912521 + 5728172089600 = 3805789^2 + 2393360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212202002121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20212202002121.

It is not a weakly prime, because it can be changed into another prime (20212202002921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106101001060 + 10106101001061.

It is an arithmetic number, because the mean of its divisors is an integer number (10106101001061).

Almost surely, 2^{20212202002121} is an apocalyptic number.

It is an amenable number.

20212202002121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212202002121 is an equidigital number, since it uses as much as digits as its factorization.

20212202002121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20212202002121 its reverse (12120020221202), we get a palindrome (32332222223323).

The spelling of 20212202002121 in words is "twenty trillion, two hundred twelve billion, two hundred two million, two thousand, one hundred twenty-one".