121421420121424 has 20 divisors (see below), whose sum is σ = 236169386713044. Its totient is φ = 60474481614848.

The previous prime is 121421420121413. The next prime is 121421420121431. The reversal of 121421420121424 is 424121024124121.

It can be written as a sum of positive squares in 2 ways, for example, as 80012452521024 + 41408967600400 = 8944968^2 + 6434980^2 .

It is a super-3 number, since 3×121421420121424³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

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, 14764273627 + ... + 14764281850.

Almost surely, 2^{121421420121424} is an apocalyptic number.

It is an amenable number.

121421420121424 is a deficient number, since it is larger than the sum of its proper divisors (114747966591620).

121421420121424 is a wasteful number, since it uses less digits than its factorization.

121421420121424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29528555742 (or 29528555736 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 31.

Adding to 121421420121424 its reverse (424121024124121), we get a palindrome (545542444245545).

The spelling of 121421420121424 in words is "one hundred twenty-one trillion, four hundred twenty-one billion, four hundred twenty million, one hundred twenty-one thousand, four hundred twenty-four".