1211011322123 has 4 divisors (see below), whose sum is σ = 1211519939088. Its totient is φ = 1210502705160.

The previous prime is 1211011322107. The next prime is 1211011322153. The reversal of 1211011322123 is 3212231101121.

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 1211011322123 - 2⁴ = 1211011322107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211011322095 and 1211011322104.

It is not an unprimeable number, because it can be changed into a prime (1211011322153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254304911 + ... + 254309672.

It is an arithmetic number, because the mean of its divisors is an integer number (302879984772).

Almost surely, 2^{1211011322123} is an apocalyptic number.

1211011322123 is a deficient number, since it is larger than the sum of its proper divisors (508616965).

1211011322123 is an equidigital number, since it uses as much as digits as its factorization.

1211011322123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508616964.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1211011322123 its reverse (3212231101121), we get a palindrome (4423242423244).

The spelling of 1211011322123 in words is "one trillion, two hundred eleven billion, eleven million, three hundred twenty-two thousand, one hundred twenty-three".