121431233220 has 192 divisors, whose sum is σ = 380184440832. Its totient is φ = 28706944000.

The previous prime is 121431233219. The next prime is 121431233263. The reversal of 121431233220 is 22332134121.

121431233220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 8709655 + ... + 8723585.

It is an arithmetic number, because the mean of its divisors is an integer number (1980127296).

Almost surely, 2^121431233220 is an apocalyptic number.

121431233220 is a gapful number since it is divisible by the number (10) 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 121431233220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190092220416).

121431233220 is an abundant number, since it is smaller than the sum of its proper divisors (258753207612).

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

121431233220 is a wasteful number, since it uses less digits than its factorization.

121431233220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14282 (or 14280 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 121431233220 its reverse (22332134121), we get a palindrome (143763367341).

Subtracting from 121431233220 its reverse (22332134121), we obtain a palindrome (99099099099).

The spelling of 121431233220 in words is "one hundred twenty-one billion, four hundred thirty-one million, two hundred thirty-three thousand, two hundred twenty".