20111321123 has 8 divisors (see below), whose sum is σ = 20178344208. Its totient is φ = 20044368864.

The previous prime is 20111321081. The next prime is 20111321173. The reversal of 20111321123 is 32112311102.

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 20111321123 - 2¹² = 20111317027 is a prime.

It is a super-2 number, since 2×20111321123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111321173) 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 7 ways as a sum of consecutive naturals, for example, 584936 + ... + 618362.

It is an arithmetic number, because the mean of its divisors is an integer number (2522293026).

Almost surely, 2^20111321123 is an apocalyptic number.

20111321123 is a deficient number, since it is larger than the sum of its proper divisors (67023085).

20111321123 is a wasteful number, since it uses less digits than its factorization.

20111321123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35413.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20111321123 its reverse (32112311102), we get a palindrome (52223632225).

The spelling of 20111321123 in words is "twenty billion, one hundred eleven million, three hundred twenty-one thousand, one hundred twenty-three".