11112012121 has 4 divisors (see below), whose sum is σ = 12699442432. Its totient is φ = 9524581812.

The previous prime is 11112012101. The next prime is 11112012127. The reversal of 11112012121 is 12121021111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12121021111 = 31 ⋅391000681.

It is a cyclic number.

It is not a de Polignac number, because 11112012121 - 2⁵ = 11112012089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11112012127) 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, 793715145 + ... + 793715158.

It is an arithmetic number, because the mean of its divisors is an integer number (3174860608).

Almost surely, 2^11112012121 is an apocalyptic number.

It is an amenable number.

11112012121 is a deficient number, since it is larger than the sum of its proper divisors (1587430311).

11112012121 is an equidigital number, since it uses as much as digits as its factorization.

11112012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587430310.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11112012121 its reverse (12121021111), we get a palindrome (23233033232).

The spelling of 11112012121 in words is "eleven billion, one hundred twelve million, twelve thousand, one hundred twenty-one".