211220201123 has 2 divisors, whose sum is σ = 211220201124. Its totient is φ = 211220201122.

The previous prime is 211220201111. The next prime is 211220201147. The reversal of 211220201123 is 321102022112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211220201123 - 2⁴ = 211220201107 is a prime.

It is a super-2 number, since 2×211220201123² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (211220201923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610100561 + 105610100562.

It is an arithmetic number, because the mean of its divisors is an integer number (105610100562).

Almost surely, 2^211220201123 is an apocalyptic number.

211220201123 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220201123 is an equidigital number, since it uses as much as digits as its factorization.

211220201123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 211220201123 its reverse (321102022112), we get a palindrome (532322223235).

The spelling of 211220201123 in words is "two hundred eleven billion, two hundred twenty million, two hundred one thousand, one hundred twenty-three".