121310212123 has 4 divisors (see below), whose sum is σ = 121323680608. Its totient is φ = 121296743640.

The previous prime is 121310212103. The next prime is 121310212129. The reversal of 121310212123 is 321212013121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321212013121 = 2389 ⋅134454589.

It is a cyclic number.

It is not a de Polignac number, because 121310212123 - 2²¹ = 121308114971 is a prime.

It is a super-5 number, since 5×121310212123⁵ (a number of 57 digits) contains 55555 as substring.

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 121310212123.

It is not an unprimeable number, because it can be changed into a prime (121310212129) 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, 6720723 + ... + 6738748.

It is an arithmetic number, because the mean of its divisors is an integer number (30330920152).

Almost surely, 2^121310212123 is an apocalyptic number.

121310212123 is a deficient number, since it is larger than the sum of its proper divisors (13468485).

121310212123 is an equidigital number, since it uses as much as digits as its factorization.

121310212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13468484.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121310212123 its reverse (321212013121), we get a palindrome (442522225244).

The spelling of 121310212123 in words is "one hundred twenty-one billion, three hundred ten million, two hundred twelve thousand, one hundred twenty-three".