20111222102021 has 2 divisors, whose sum is σ = 20111222102022. Its totient is φ = 20111222102020.

The previous prime is 20111222102003. The next prime is 20111222102053. The reversal of 20111222102021 is 12020122211102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14788562448100 + 5322659653921 = 3845590^2 + 2307089^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111222102021 - 2¹⁰ = 20111222100997 is a prime.

It is a super-2 number, since 2×20111222102021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111222101021) 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, 10055611051010 + 10055611051011.

It is an arithmetic number, because the mean of its divisors is an integer number (10055611051011).

Almost surely, 2^{20111222102021} is an apocalyptic number.

It is an amenable number.

20111222102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111222102021 is an equidigital number, since it uses as much as digits as its factorization.

20111222102021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20111222102021 its reverse (12020122211102), we get a palindrome (32131344313123).

The spelling of 20111222102021 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-two million, one hundred two thousand, twenty-one".