1111202120121 has 16 divisors (see below), whose sum is σ = 1521736296000. Its totient is φ = 720737051328.

The previous prime is 1111202120099. The next prime is 1111202120129. The reversal of 1111202120121 is 1210212021111.

It is a happy number.

It is not a de Polignac number, because 1111202120121 - 2⁶ = 1111202120057 is a prime.

It is a super-2 number, since 2×1111202120121² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1111202120121.

It is not an unprimeable number, because it can be changed into a prime (1111202120129) 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 15 ways as a sum of consecutive naturals, for example, 1642330 + ... + 2218028.

It is an arithmetic number, because the mean of its divisors is an integer number (95108518500).

Almost surely, 2^{1111202120121} is an apocalyptic number.

It is an amenable number.

1111202120121 is a deficient number, since it is larger than the sum of its proper divisors (410534175879).

1111202120121 is a wasteful number, since it uses less digits than its factorization.

1111202120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593128.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1111202120121 its reverse (1210212021111), we get a palindrome (2321414141232).

The spelling of 1111202120121 in words is "one trillion, one hundred eleven billion, two hundred two million, one hundred twenty thousand, one hundred twenty-one".