121211123 has 4 divisors (see below), whose sum is σ = 132230328. Its totient is φ = 110191920.

The previous prime is 121211113. The next prime is 121211137. The reversal of 121211123 is 321112121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121211123 - 2⁶ = 121211059 is a prime.

It is a super-2 number, since 2×121211123² = 29384272677842258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121211098 and 121211107.

It is not an unprimeable number, because it can be changed into a prime (121211113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5509586 + ... + 5509607.

It is an arithmetic number, because the mean of its divisors is an integer number (33057582).

Almost surely, 2^121211123 is an apocalyptic number.

121211123 is a deficient number, since it is larger than the sum of its proper divisors (11019205).

121211123 is a wasteful number, since it uses less digits than its factorization.

121211123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11019204.

The product of its digits is 24, while the sum is 14.

The square root of 121211123 is about 11009.5923176110. The cubic root of 121211123 is about 494.8962446211.

Adding to 121211123 its reverse (321112121), we get a palindrome (442323244).

The spelling of 121211123 in words is "one hundred twenty-one million, two hundred eleven thousand, one hundred twenty-three".