20101211212223 has 4 divisors (see below), whose sum is σ = 20101234612728. Its totient is φ = 20101187811720.

The previous prime is 20101211212189. The next prime is 20101211212237. The reversal of 20101211212223 is 32221211210102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20101211212223 - 2⁸ = 20101211211967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101211212195 and 20101211212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101211212273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10360613 + ... + 12146798.

It is an arithmetic number, because the mean of its divisors is an integer number (5025308653182).

Almost surely, 2^{20101211212223} is an apocalyptic number.

20101211212223 is a deficient number, since it is larger than the sum of its proper divisors (23400505).

20101211212223 is an equidigital number, since it uses as much as digits as its factorization.

20101211212223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23400504.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 20101211212223 its reverse (32221211210102), we get a palindrome (52322422422325).

The spelling of 20101211212223 in words is "twenty trillion, one hundred one billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty-three".