121431221455 has 8 divisors (see below), whose sum is σ = 145911501504. Its totient is φ = 97015620000.

The previous prime is 121431221449. The next prime is 121431221479. The reversal of 121431221455 is 554122134121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121431221455 - 2¹¹ = 121431219407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16165516 + ... + 16173025.

It is an arithmetic number, because the mean of its divisors is an integer number (18238937688).

Almost surely, 2^121431221455 is an apocalyptic number.

121431221455 is a deficient number, since it is larger than the sum of its proper divisors (24480280049).

121431221455 is an equidigital number, since it uses as much as digits as its factorization.

121431221455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32339297.

The product of its digits is 9600, while the sum is 31.

Adding to 121431221455 its reverse (554122134121), we get a palindrome (675553355576).

The spelling of 121431221455 in words is "one hundred twenty-one billion, four hundred thirty-one million, two hundred twenty-one thousand, four hundred fifty-five".