121212410423 has 16 divisors (see below), whose sum is σ = 136489522176. Its totient is φ = 106805566560.

The previous prime is 121212410419. The next prime is 121212410477. The reversal of 121212410423 is 324014212121.

It is a cyclic number.

It is not a de Polignac number, because 121212410423 - 2² = 121212410419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212440423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266015 + ... + 559632.

It is an arithmetic number, because the mean of its divisors is an integer number (8530595136).

Almost surely, 2^121212410423 is an apocalyptic number.

121212410423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121212410423 is a deficient number, since it is larger than the sum of its proper divisors (15277111753).

121212410423 is a wasteful number, since it uses less digits than its factorization.

121212410423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826174.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 121212410423 its reverse (324014212121), we get a palindrome (445226622544).

The spelling of 121212410423 in words is "one hundred twenty-one billion, two hundred twelve million, four hundred ten thousand, four hundred twenty-three".