20021001193 has 2 divisors, whose sum is σ = 20021001194. Its totient is φ = 20021001192.

The previous prime is 20021001191. The next prime is 20021001229. The reversal of 20021001193 is 39110012002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17743039209 + 2277961984 = 133203^2 + 47728^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021001193 - 2¹ = 20021001191 is a prime.

Together with 20021001191, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20021001193.

It is not a weakly prime, because it can be changed into another prime (20021001191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010500596 + 10010500597.

It is an arithmetic number, because the mean of its divisors is an integer number (10010500597).

Almost surely, 2^20021001193 is an apocalyptic number.

It is an amenable number.

20021001193 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021001193 is an equidigital number, since it uses as much as digits as its factorization.

20021001193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 20021001193 its reverse (39110012002), we get a palindrome (59131013195).

The spelling of 20021001193 in words is "twenty billion, twenty-one million, one thousand, one hundred ninety-three".