20021102010989 has 2 divisors, whose sum is σ = 20021102010990. Its totient is φ = 20021102010988.

The previous prime is 20021102010953. The next prime is 20021102010991. The reversal of 20021102010989 is 98901020112002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13487623502500 + 6533478508489 = 3672550^2 + 2556067^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021102010989 - 2⁸ = 20021102010733 is a prime.

Together with 20021102010991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021102000989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010551005494 + 10010551005495.

It is an arithmetic number, because the mean of its divisors is an integer number (10010551005495).

Almost surely, 2^{20021102010989} is an apocalyptic number.

It is an amenable number.

20021102010989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021102010989 is an equidigital number, since it uses as much as digits as its factorization.

20021102010989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 20021102010989 in words is "twenty trillion, twenty-one billion, one hundred two million, ten thousand, nine hundred eighty-nine".