20002221110021 has 2 divisors, whose sum is σ = 20002221110022. Its totient is φ = 20002221110020.

The previous prime is 20002221110009. The next prime is 20002221110029. The reversal of 20002221110021 is 12001112220002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19819858802500 + 182362307521 = 4451950^2 + 427039^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002221110021 - 2¹⁴ = 20002221093637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20002221109978 and 20002221110005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20002221110029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001110555010 + 10001110555011.

It is an arithmetic number, because the mean of its divisors is an integer number (10001110555011).

Almost surely, 2^{20002221110021} is an apocalyptic number.

It is an amenable number.

20002221110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002221110021 is an equidigital number, since it uses as much as digits as its factorization.

20002221110021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20002221110021 its reverse (12001112220002), we get a palindrome (32003333330023).

The spelling of 20002221110021 in words is "twenty trillion, two billion, two hundred twenty-one million, one hundred ten thousand, twenty-one".