1111221210121 has 8 divisors (see below), whose sum is σ = 1212328692288. Its totient is φ = 1010128290000.

The previous prime is 1111221210107. The next prime is 1111221210149. The reversal of 1111221210121 is 1210121221111.

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 1111221210121 - 2²⁹ = 1110684339209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111221210095 and 1111221210104.

It is not an unprimeable number, because it can be changed into a prime (1111221210161) 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, 3480645 + ... + 3786466.

It is an arithmetic number, because the mean of its divisors is an integer number (151541086536).

Almost surely, 2^{1111221210121} is an apocalyptic number.

1111221210121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111221210121 is a deficient number, since it is larger than the sum of its proper divisors (101107482167).

1111221210121 is a wasteful number, since it uses less digits than its factorization.

1111221210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7281023.

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

Adding to 1111221210121 its reverse (1210121221111), we get a palindrome (2321342431232).

The spelling of 1111221210121 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".