11312121123 has 32 divisors (see below), whose sum is σ = 17308928000. Its totient is φ = 7294082400.

The previous prime is 11312121109. The next prime is 11312121131. The reversal of 11312121123 is 32112121311.

It is not a de Polignac number, because 11312121123 - 2¹⁷ = 11311990051 is a prime.

It is a super-2 number, since 2×11312121123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11312121096 and 11312121105.

It is not an unprimeable number, because it can be changed into a prime (11312121193) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2484453 + ... + 2489001.

It is an arithmetic number, because the mean of its divisors is an integer number (540904000).

Almost surely, 2^11312121123 is an apocalyptic number.

11312121123 is a deficient number, since it is larger than the sum of its proper divisors (5996806877).

11312121123 is a wasteful number, since it uses less digits than its factorization.

11312121123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7560 (or 7554 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11312121123 its reverse (32112121311), we get a palindrome (43424242434).

The spelling of 11312121123 in words is "eleven billion, three hundred twelve million, one hundred twenty-one thousand, one hundred twenty-three".