124121121121421 has 4 divisors (see below), whose sum is σ = 124751177574012. Its totient is φ = 123491064668832.

The previous prime is 124121121121409. The next prime is 124121121121429.

124121121121421 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102479886865225 + 21641234256196 = 10123235^2 + 4652014^2 .

It is a cyclic number.

It is not a de Polignac number, because 124121121121421 - 2³⁴ = 124103941252237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124121121121429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315028226000 + ... + 315028226393.

It is an arithmetic number, because the mean of its divisors is an integer number (31187794393503).

Almost surely, 2^{124121121121421} is an apocalyptic number.

It is an amenable number.

124121121121421 is a deficient number, since it is larger than the sum of its proper divisors (630056452591).

124121121121421 is an equidigital number, since it uses as much as digits as its factorization.

124121121121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630056452590.

The product of its digits is 512, while the sum is 26.

The spelling of 124121121121421 in words is "one hundred twenty-four trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, four hundred twenty-one".