1111111202121 has 8 divisors (see below), whose sum is σ = 1502347541184. Its totient is φ = 730307832240.

The previous prime is 1111111202101. The next prime is 1111111202153. The reversal of 1111111202121 is 1212021111111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1111111202121 - 2⁶ = 1111111202057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1111111202121.

It is not an unprimeable number, because it can be changed into a prime (1111111202101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2608242046 + ... + 2608242471.

It is an arithmetic number, because the mean of its divisors is an integer number (187793442648).

Almost surely, 2^{1111111202121} is an apocalyptic number.

It is an amenable number.

1111111202121 is a deficient number, since it is larger than the sum of its proper divisors (391236339063).

1111111202121 is an equidigital number, since it uses as much as digits as its factorization.

1111111202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5216484591.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1111111202121 its reverse (1212021111111), we get a palindrome (2323132313232).

The spelling of 1111111202121 in words is "one trillion, one hundred eleven billion, one hundred eleven million, two hundred two thousand, one hundred twenty-one".