11111112121001 has 4 divisors (see below), whose sum is σ = 11142062294400. Its totient is φ = 11080161947604.

The previous prime is 11111112120973. The next prime is 11111112121009. The reversal of 11111112121001 is 10012121111111.

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.

It is a cyclic number.

It is not a de Polignac number, because 11111112121001 - 2¹⁰ = 11111112119977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111112121009) 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, 15475086161 + ... + 15475086878.

It is an arithmetic number, because the mean of its divisors is an integer number (2785515573600).

Almost surely, 2^{11111112121001} is an apocalyptic number.

It is an amenable number.

11111112121001 is a deficient number, since it is larger than the sum of its proper divisors (30950173399).

11111112121001 is an equidigital number, since it uses as much as digits as its factorization.

11111112121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30950173398.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 11111112121001 its reverse (10012121111111), we get a palindrome (21123233232112).

The spelling of 11111112121001 in words is "eleven trillion, one hundred eleven billion, one hundred twelve million, one hundred twenty-one thousand, one".