1211020123 has 2 divisors, whose sum is σ = 1211020124. Its totient is φ = 1211020122.

The previous prime is 1211020121. The next prime is 1211020159. The reversal of 1211020123 is 3210201121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211020123 - 2¹ = 1211020121 is a prime.

Together with 1211020121, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1211020121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605510061 + 605510062.

It is an arithmetic number, because the mean of its divisors is an integer number (605510062).

Almost surely, 2^1211020123 is an apocalyptic number.

1211020123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211020123 is an equidigital number, since it uses as much as digits as its factorization.

1211020123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1211020123 is about 34799.7144097477. The cubic root of 1211020123 is about 1065.9016141787.

Adding to 1211020123 its reverse (3210201121), we get a palindrome (4421221244).

The spelling of 1211020123 in words is "one billion, two hundred eleven million, twenty thousand, one hundred twenty-three".