121431221443 has 8 divisors (see below), whose sum is σ = 138808764512. Its totient is φ = 104061234816.

The previous prime is 121431221393. The next prime is 121431221449. The reversal of 121431221443 is 344122134121.

It is a happy number.

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

It is not a de Polignac number, because 121431221443 - 2¹⁷ = 121431090371 is a prime.

It is a super-2 number, since 2×121431221443² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121431221449) 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 7 ways as a sum of consecutive naturals, for example, 1854630 + ... + 1918987.

It is an arithmetic number, because the mean of its divisors is an integer number (17351095564).

Almost surely, 2^121431221443 is an apocalyptic number.

121431221443 is a deficient number, since it is larger than the sum of its proper divisors (17377543069).

121431221443 is an equidigital number, since it uses as much as digits as its factorization.

121431221443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3778221.

The product of its digits is 4608, while the sum is 28.

Adding to 121431221443 its reverse (344122134121), we get a palindrome (465553355564).

The spelling of 121431221443 in words is "one hundred twenty-one billion, four hundred thirty-one million, two hundred twenty-one thousand, four hundred forty-three".