121431221448 has 128 divisors (see below), whose sum is σ = 314793216000. Its totient is φ = 39004727040.

The previous prime is 121431221393. The next prime is 121431221449. The reversal of 121431221448 is 844122134121.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (121431221449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43074583 + ... + 43077401.

It is an arithmetic number, because the mean of its divisors is an integer number (2459322000).

Almost surely, 2^121431221448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121431221448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157396608000).

121431221448 is an abundant number, since it is smaller than the sum of its proper divisors (193361994552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121431221448 is a wasteful number, since it uses less digits than its factorization.

121431221448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315 (or 3311 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

Adding to 121431221448 its reverse (844122134121), we get a palindrome (965553355569).

The spelling of 121431221448 in words is "one hundred twenty-one billion, four hundred thirty-one million, two hundred twenty-one thousand, four hundred forty-eight".