11111002121 has 4 divisors (see below), whose sum is σ = 11218876032. Its totient is φ = 11003128212.

The previous prime is 11111002099. The next prime is 11111002181. The reversal of 11111002121 is 12120011111.

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 11111002121 - 2⁶ = 11111002057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111002181) 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, 53936801 + ... + 53937006.

It is an arithmetic number, because the mean of its divisors is an integer number (2804719008).

Almost surely, 2^11111002121 is an apocalyptic number.

It is an amenable number.

11111002121 is a deficient number, since it is larger than the sum of its proper divisors (107873911).

11111002121 is a wasteful number, since it uses less digits than its factorization.

11111002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107873910.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11111002121 its reverse (12120011111), we get a palindrome (23231013232).

The spelling of 11111002121 in words is "eleven billion, one hundred eleven million, two thousand, one hundred twenty-one".