20111221220023 has 2 divisors, whose sum is σ = 20111221220024. Its totient is φ = 20111221220022.

The previous prime is 20111221220009. The next prime is 20111221220141. The reversal of 20111221220023 is 32002212211102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20111221220023 - 2¹³ = 20111221211831 is a prime.

It is a super-2 number, since 2×20111221220023² (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 (20111221250023) 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, 10055610610011 + 10055610610012.

It is an arithmetic number, because the mean of its divisors is an integer number (10055610610012).

Almost surely, 2^{20111221220023} is an apocalyptic number.

20111221220023 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111221220023 is an equidigital number, since it uses as much as digits as its factorization.

20111221220023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20111221220023 its reverse (32002212211102), we get a palindrome (52113433431125).

The spelling of 20111221220023 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, twenty-three".