121381195540 has 48 divisors (see below), whose sum is σ = 279609692544. Its totient is φ = 43894742400.

The previous prime is 121381195517. The next prime is 121381195549. The reversal of 121381195540 is 45591183121.

It is a junction number, because it is equal to n+sod(n) for n = 121381195493 and 121381195502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121381195549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1484304 + ... + 1563943.

It is an arithmetic number, because the mean of its divisors is an integer number (5825201928).

Almost surely, 2^121381195540 is an apocalyptic number.

121381195540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121381195540 is an abundant number, since it is smaller than the sum of its proper divisors (158228497004).

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

121381195540 is a wasteful number, since it uses less digits than its factorization.

121381195540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048448 (or 3048446 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 40.

The spelling of 121381195540 in words is "one hundred twenty-one billion, three hundred eighty-one million, one hundred ninety-five thousand, five hundred forty".