121210211221123 has 4 divisors (see below), whose sum is σ = 121212246340728. Its totient is φ = 121208176101520.

The previous prime is 121210211221097. The next prime is 121210211221133. The reversal of 121210211221123 is 321122112012121.

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 121210211221123 - 2¹³ = 121210211212931 is a prime.

It is a super-2 number, since 2×121210211221123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121210211221094 and 121210211221103.

It is not an unprimeable number, because it can be changed into a prime (121210211221133) 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, 1017470461 + ... + 1017589582.

It is an arithmetic number, because the mean of its divisors is an integer number (30303061585182).

Almost surely, 2^{121210211221123} is an apocalyptic number.

121210211221123 is a deficient number, since it is larger than the sum of its proper divisors (2035119605).

121210211221123 is an equidigital number, since it uses as much as digits as its factorization.

121210211221123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035119604.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 121210211221123 its reverse (321122112012121), we get a palindrome (442332323233244).

The spelling of 121210211221123 in words is "one hundred twenty-one trillion, two hundred ten billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty-three".