121331641554040 has 64 divisors (see below), whose sum is σ = 282429014436000. Its totient is φ = 46855937748480.

The previous prime is 121331641554029. The next prime is 121331641554113. The reversal of 121331641554040 is 40455146133121.

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 = 121331641553984 and 121331641554002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13593766 + ... + 20674954.

Almost surely, 2^{121331641554040} is an apocalyptic number.

121331641554040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121331641554040 is an abundant number, since it is smaller than the sum of its proper divisors (161097372881960).

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

121331641554040 is a wasteful number, since it uses less digits than its factorization.

121331641554040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7096000 (or 7095996 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

Adding to 121331641554040 its reverse (40455146133121), we get a palindrome (161786787687161).

The spelling of 121331641554040 in words is "one hundred twenty-one trillion, three hundred thirty-one billion, six hundred forty-one million, five hundred fifty-four thousand, forty".