11555213023 has 4 divisors (see below), whose sum is σ = 11643420888. Its totient is φ = 11467005160.

The previous prime is 11555212993. The next prime is 11555213053. The reversal of 11555213023 is 32031255511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32031255511 = 55343 ⋅578777.

It is an interprime number because it is at equal distance from previous prime (11555212993) and next prime (11555213053).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11555213023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11555212982 and 11555213000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555213053) 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, 44103736 + ... + 44103997.

It is an arithmetic number, because the mean of its divisors is an integer number (2910855222).

Almost surely, 2^11555213023 is an apocalyptic number.

11555213023 is a deficient number, since it is larger than the sum of its proper divisors (88207865).

11555213023 is an equidigital number, since it uses as much as digits as its factorization.

11555213023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88207864.

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 11555213023 its reverse (32031255511), we get a palindrome (43586468534).

The spelling of 11555213023 in words is "eleven billion, five hundred fifty-five million, two hundred thirteen thousand, twenty-three".