121321211132220 has 192 divisors, whose sum is σ = 374267850324480. Its totient is φ = 29118635136000.

The previous prime is 121321211132141. The next prime is 121321211132267. The reversal of 121321211132220 is 22231112123121.

It is a congruent number.

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, 2680575951 + ... + 2680621209.

It is an arithmetic number, because the mean of its divisors is an integer number (1949311720440).

Almost surely, 2^{121321211132220} is an apocalyptic number.

121321211132220 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 121321211132220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187133925162240).

121321211132220 is an abundant number, since it is smaller than the sum of its proper divisors (252946639192260).

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

121321211132220 is a wasteful number, since it uses less digits than its factorization.

121321211132220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85596 (or 85594 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 121321211132220 its reverse (22231112123121), we get a palindrome (143552323255341).

Subtracting from 121321211132220 its reverse (22231112123121), we obtain a palindrome (99090099009099).

The spelling of 121321211132220 in words is "one hundred twenty-one trillion, three hundred twenty-one billion, two hundred eleven million, one hundred thirty-two thousand, two hundred twenty".