121210013123 has 4 divisors (see below), whose sum is σ = 121211717088. Its totient is φ = 121208309160.

The previous prime is 121210013117. The next prime is 121210013131. The reversal of 121210013123 is 321310012121.

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 121210013123 - 2¹⁶ = 121209947587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121210013153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 740411 + ... + 889172.

It is an arithmetic number, because the mean of its divisors is an integer number (30302929272).

Almost surely, 2^121210013123 is an apocalyptic number.

121210013123 is a deficient number, since it is larger than the sum of its proper divisors (1703965).

121210013123 is an equidigital number, since it uses as much as digits as its factorization.

121210013123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703964.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 121210013123 its reverse (321310012121), we get a palindrome (442520025244).

The spelling of 121210013123 in words is "one hundred twenty-one billion, two hundred ten million, thirteen thousand, one hundred twenty-three".