121341534215440 has 160 divisors (see below), whose sum is σ = 351751920436224. Its totient is φ = 37818688734720.

The previous prime is 121341534215381. The next prime is 121341534215449. The reversal of 121341534215440 is 44512435143121.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 121341534215393 and 121341534215402.

It is not an unprimeable number, because it can be changed into a prime (121341534215449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115203667 + ... + 116252173.

Almost surely, 2^{121341534215440} is an apocalyptic number.

121341534215440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121341534215440 is an abundant number, since it is smaller than the sum of its proper divisors (230410386220784).

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

121341534215440 is a wasteful number, since it uses less digits than its factorization.

121341534215440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067325 (or 1067319 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

Adding to 121341534215440 its reverse (44512435143121), we get a palindrome (165853969358561).

The spelling of 121341534215440 in words is "one hundred twenty-one trillion, three hundred forty-one billion, five hundred thirty-four million, two hundred fifteen thousand, four hundred forty".