121211212123 has 8 divisors (see below), whose sum is σ = 128369046528. Its totient is φ = 114210692904.

The previous prime is 121211212103. The next prime is 121211212289. The reversal of 121211212123 is 321212112121.

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 121211212123 - 2⁵ = 121211212091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121211212123.

It is not an unprimeable number, because it can be changed into a prime (121211212103) 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, 39327211 + ... + 39330292.

It is an arithmetic number, because the mean of its divisors is an integer number (16046130816).

Almost surely, 2^121211212123 is an apocalyptic number.

121211212123 is a deficient number, since it is larger than the sum of its proper divisors (7157834405).

121211212123 is an equidigital number, since it uses as much as digits as its factorization.

121211212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78657593.

The product of its digits is 96, while the sum is 19.

Adding to 121211212123 its reverse (321212112121), we get a palindrome (442423324244).

The spelling of 121211212123 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-three".