121501001040 has 80 divisors (see below), whose sum is σ = 379181088000. Its totient is φ = 32182806016.

The previous prime is 121501001023. The next prime is 121501001113. The reversal of 121501001040 is 40100105121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1663080 + ... + 1734599.

It is an arithmetic number, because the mean of its divisors is an integer number (4739763600).

Almost surely, 2^121501001040 is an apocalyptic number.

121501001040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121501001040 is an abundant number, since it is smaller than the sum of its proper divisors (257680086960).

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

121501001040 is a wasteful number, since it uses less digits than its factorization.

121501001040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3397844 (or 3397838 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 121501001040 its reverse (40100105121), we get a palindrome (161601106161).

The spelling of 121501001040 in words is "one hundred twenty-one billion, five hundred one million, one thousand, forty".