231121221344420 has 192 divisors, whose sum is σ = 545844049212672. Its totient is φ = 81472573440000.

The previous prime is 231121221344401. The next prime is 231121221344449. The reversal of 231121221344420 is 24443122121132.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7499780852 + ... + 7499811668.

It is an arithmetic number, because the mean of its divisors is an integer number (2842937756316).

Almost surely, 2^{231121221344420} is an apocalyptic number.

231121221344420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231121221344420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272922024606336).

231121221344420 is an abundant number, since it is smaller than the sum of its proper divisors (314722827868252).

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

231121221344420 is a wasteful number, since it uses less digits than its factorization.

231121221344420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36142 (or 36140 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 231121221344420 its reverse (24443122121132), we get a palindrome (255564343465552).

It can be divided in two parts, 2311212 and 21344420, that added together give a palindrome (23655632).

The spelling of 231121221344420 in words is "two hundred thirty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, three hundred forty-four thousand, four hundred twenty".