2001022222021 has 2 divisors, whose sum is σ = 2001022222022. Its totient is φ = 2001022222020.

The previous prime is 2001022221977. The next prime is 2001022222039. The reversal of 2001022222021 is 1202222201002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1171622232225 + 829399989796 = 1082415^2 + 910714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001022222021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001022221986 and 2001022222004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001022222321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000511111010 + 1000511111011.

It is an arithmetic number, because the mean of its divisors is an integer number (1000511111011).

Almost surely, 2^{2001022222021} is an apocalyptic number.

It is an amenable number.

2001022222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001022222021 is an equidigital number, since it uses as much as digits as its factorization.

2001022222021 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 16.

Adding to 2001022222021 its reverse (1202222201002), we get a palindrome (3203244423023).

The spelling of 2001022222021 in words is "two trillion, one billion, twenty-two million, two hundred twenty-two thousand, twenty-one".