20101221111163 has 2 divisors, whose sum is σ = 20101221111164. Its totient is φ = 20101221111162.

The previous prime is 20101221111133. The next prime is 20101221111193. The reversal of 20101221111163 is 36111112210102.

It is a balanced prime because it is at equal distance from previous prime (20101221111133) and next prime (20101221111193).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20101221111163 is a prime.

It is a super-3 number, since 3×20101221111163³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20101221111133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050610555581 + 10050610555582.

It is an arithmetic number, because the mean of its divisors is an integer number (10050610555582).

Almost surely, 2^{20101221111163} is an apocalyptic number.

20101221111163 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101221111163 is an equidigital number, since it uses as much as digits as its factorization.

20101221111163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 20101221111163 its reverse (36111112210102), we get a palindrome (56212333321265).

The spelling of 20101221111163 in words is "twenty trillion, one hundred one billion, two hundred twenty-one million, one hundred eleven thousand, one hundred sixty-three".