20021020212001 has 2 divisors, whose sum is σ = 20021020212002. Its totient is φ = 20021020212000.

The previous prime is 20021020211957. The next prime is 20021020212059. The reversal of 20021020212001 is 10021202012002.

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., 14318285170401 + 5702735041600 = 3783951^2 + 2388040^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021020212001 - 2³⁷ = 19883581258529 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021020212091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010510106000 + 10010510106001.

It is an arithmetic number, because the mean of its divisors is an integer number (10010510106001).

Almost surely, 2^{20021020212001} is an apocalyptic number.

It is an amenable number.

20021020212001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021020212001 is an equidigital number, since it uses as much as digits as its factorization.

20021020212001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021020212001 its reverse (10021202012002), we get a palindrome (30042222224003).

The spelling of 20021020212001 in words is "twenty trillion, twenty-one billion, twenty million, two hundred twelve thousand, one".