121121 has 16 divisors (see below), whose sum is σ = 163968. Its totient is φ = 87120.

The previous prime is 121081. The next prime is 121123.

121121 = T₁₃ + T₁₄ + ... + T₈₉.

121121 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 121121 - 2¹⁰ = 120097 is a prime.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 121099 and 121108.

It is not an unprimeable number, because it can be changed into a prime (121123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9311 + ... + 9323.

It is an arithmetic number, because the mean of its divisors is an integer number (10248).

2¹²¹¹²¹ is an apocalyptic number.

121121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121121 is a deficient number, since it is larger than the sum of its proper divisors (42847).

121121 is an equidigital number, since it uses as much as digits as its factorization.

121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53 (or 31 counting only the distinct ones).

The product of its digits is 4, while the sum is 8.

The square root of 121121 is about 348.0244244302. The cubic root of 121121 is about 49.4773558980.

It can be divided in two parts, 121 and 121, that added together give a palindrome (242).

The spelling of 121121 in words is "one hundred twenty-one thousand, one hundred twenty-one", and thus it is an iban number.