211220012012123 has 2 divisors, whose sum is σ = 211220012012124. Its totient is φ = 211220012012122.

The previous prime is 211220012012081. The next prime is 211220012012131. The reversal of 211220012012123 is 321210210022112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211220012012123 - 2³⁰ = 211218938270299 is a prime.

It is a super-2 number, since 2×211220012012123² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211220012012095 and 211220012012104.

It is not a weakly prime, because it can be changed into another prime (211220012011123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610006006061 + 105610006006062.

It is an arithmetic number, because the mean of its divisors is an integer number (105610006006062).

Almost surely, 2^{211220012012123} is an apocalyptic number.

211220012012123 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220012012123 is an equidigital number, since it uses as much as digits as its factorization.

211220012012123 is an evil number, because the sum of its binary digits is even.

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

Adding to 211220012012123 its reverse (321210210022112), we get a palindrome (532430222034235).

The spelling of 211220012012123 in words is "two hundred eleven trillion, two hundred twenty billion, twelve million, twelve thousand, one hundred twenty-three".