121645035540 has 144 divisors (see below), whose sum is σ = 422092000512. Its totient is φ = 27778917888.

The previous prime is 121645035527. The next prime is 121645035563. The reversal of 121645035540 is 45530546121.

121645035540 is a `hidden beast` number, since 1 + 2 + 1 + 64 + 50 + 3 + 5 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 121645035495 and 121645035504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1338217 + ... + 1426223.

It is an arithmetic number, because the mean of its divisors is an integer number (2931194448).

Almost surely, 2^121645035540 is an apocalyptic number.

121645035540 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 121645035540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211046000256).

121645035540 is an abundant number, since it is smaller than the sum of its proper divisors (300446964972).

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

121645035540 is a wasteful number, since it uses less digits than its factorization.

121645035540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89126 (or 89121 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 121645035540 in words is "one hundred twenty-one billion, six hundred forty-five million, thirty-five thousand, five hundred forty".