121345043540 has 72 divisors (see below), whose sum is σ = 297324955872. Its totient is φ = 41478212160.

The previous prime is 121345043537. The next prime is 121345043593. The reversal of 121345043540 is 45340543121.

It is a junction number, because it is equal to n+sod(n) for n = 121345043497 and 121345043506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137339 + ... + 511421.

It is an arithmetic number, because the mean of its divisors is an integer number (4129513276).

Almost surely, 2^121345043540 is an apocalyptic number.

121345043540 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 121345043540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148662477936).

121345043540 is an abundant number, since it is smaller than the sum of its proper divisors (175979912332).

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

121345043540 is a wasteful number, since it uses less digits than its factorization.

121345043540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374437 (or 374428 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 121345043540 its reverse (45340543121), we get a palindrome (166685586661).

The spelling of 121345043540 in words is "one hundred twenty-one billion, three hundred forty-five million, forty-three thousand, five hundred forty".