121321421340 has 192 divisors, whose sum is σ = 392598226944. Its totient is φ = 27420106752.

The previous prime is 121321421327. The next prime is 121321421369. The reversal of 121321421340 is 43124123121.

It is a self number, because there is not a number n which added to its sum of digits gives 121321421340.

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, 15129012 + ... + 15137028.

It is an arithmetic number, because the mean of its divisors is an integer number (2044782432).

Almost surely, 2^121321421340 is an apocalyptic number.

121321421340 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 121321421340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196299113472).

121321421340 is an abundant number, since it is smaller than the sum of its proper divisors (271276805604).

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

121321421340 is a wasteful number, since it uses less digits than its factorization.

121321421340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8436 (or 8434 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 121321421340 its reverse (43124123121), we get a palindrome (164445544461).

The spelling of 121321421340 in words is "one hundred twenty-one billion, three hundred twenty-one million, four hundred twenty-one thousand, three hundred forty".