11111210121 has 8 divisors (see below), whose sum is σ = 16161760224. Its totient is φ = 6734066720.

The previous prime is 11111210087. The next prime is 11111210153. The reversal of 11111210121 is 12101211111.

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 11111210121 - 2⁹ = 11111209609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11111210097 and 11111210106.

It is not an unprimeable number, because it can be changed into a prime (11111210161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168351636 + ... + 168351701.

It is an arithmetic number, because the mean of its divisors is an integer number (2020220028).

Almost surely, 2^11111210121 is an apocalyptic number.

11111210121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11111210121 is a deficient number, since it is larger than the sum of its proper divisors (5050550103).

11111210121 is a wasteful number, since it uses less digits than its factorization.

11111210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336703351.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 11111210121 its reverse (12101211111), we get a palindrome (23212421232).

It can be divided in two parts, 1111 and 1210121, that multiplied together give a palindrome (1344444431).

The spelling of 11111210121 in words is "eleven billion, one hundred eleven million, two hundred ten thousand, one hundred twenty-one".