121131321210 has 160 divisors (see below), whose sum is σ = 334488179520. Its totient is φ = 31436439552.

The previous prime is 121131321203. The next prime is 121131321211. The reversal of 121131321210 is 12123131121.

121131321210 is a `hidden beast` number, since 1 + 2 + 1 + 131 + 321 + 210 = 666.

121131321210 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (121131321211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 9850746 + ... + 9863034.

It is an arithmetic number, because the mean of its divisors is an integer number (2090551122).

Almost surely, 2^121131321210 is an apocalyptic number.

121131321210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121131321210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167244089760).

121131321210 is an abundant number, since it is smaller than the sum of its proper divisors (213356858310).

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

121131321210 is a wasteful number, since it uses less digits than its factorization.

121131321210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12634 (or 12625 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 121131321210 its reverse (12123131121), we get a palindrome (133254452331).

The spelling of 121131321210 in words is "one hundred twenty-one billion, one hundred thirty-one million, three hundred twenty-one thousand, two hundred ten".