20122102102021 has 2 divisors, whose sum is σ = 20122102102022. Its totient is φ = 20122102102020.

The previous prime is 20122102102019. The next prime is 20122102102057. The reversal of 20122102102021 is 12020120122102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19096113408100 + 1025988693921 = 4369910^2 + 1012911^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122102102021 - 2¹ = 20122102102019 is a prime.

Together with 20122102102019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20122102101986 and 20122102102004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122102102001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061051051010 + 10061051051011.

It is an arithmetic number, because the mean of its divisors is an integer number (10061051051011).

Almost surely, 2^{20122102102021} is an apocalyptic number.

It is an amenable number.

20122102102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122102102021 is an equidigital number, since it uses as much as digits as its factorization.

20122102102021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20122102102021 its reverse (12020120122102), we get a palindrome (32142222224123).

The spelling of 20122102102021 in words is "twenty trillion, one hundred twenty-two billion, one hundred two million, one hundred two thousand, twenty-one".