1211220113123 has 16 divisors (see below), whose sum is σ = 1231140917952. Its totient is φ = 1191382080000.

The previous prime is 1211220113111. The next prime is 1211220113137. The reversal of 1211220113123 is 3213110221121.

It is a cyclic number.

It is not a de Polignac number, because 1211220113123 - 2¹² = 1211220109027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211220113095 and 1211220113104.

It is not an unprimeable number, because it can be changed into a prime (1211220113723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55803173 + ... + 55824873.

It is an arithmetic number, because the mean of its divisors is an integer number (76946307372).

Almost surely, 2^{1211220113123} is an apocalyptic number.

1211220113123 is a deficient number, since it is larger than the sum of its proper divisors (19920804829).

1211220113123 is a wasteful number, since it uses less digits than its factorization.

1211220113123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23566.

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

Adding to 1211220113123 its reverse (3213110221121), we get a palindrome (4424330334244).

The spelling of 1211220113123 in words is "one trillion, two hundred eleven billion, two hundred twenty million, one hundred thirteen thousand, one hundred twenty-three".