1213111203123 has 8 divisors (see below), whose sum is σ = 1628337186000. Its totient is φ = 803313011168.

The previous prime is 1213111203091. The next prime is 1213111203127. The reversal of 1213111203123 is 3213021113121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213111203123 - 2⁵ = 1213111203091 is a prime.

It is a super-2 number, since 2×1213111203123² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1213111203123.

It is not an unprimeable number, because it can be changed into a prime (1213111203127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1356947208 + ... + 1356948101.

It is an arithmetic number, because the mean of its divisors is an integer number (203542148250).

Almost surely, 2^{1213111203123} is an apocalyptic number.

1213111203123 is a deficient number, since it is larger than the sum of its proper divisors (415225982877).

1213111203123 is a wasteful number, since it uses less digits than its factorization.

1213111203123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713895461.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1213111203123 its reverse (3213021113121), we get a palindrome (4426132316244).

The spelling of 1213111203123 in words is "one trillion, two hundred thirteen billion, one hundred eleven million, two hundred three thousand, one hundred twenty-three".