121751671640 has 32 divisors (see below), whose sum is σ = 281345082480. Its totient is φ = 47384433792.

The previous prime is 121751671627. The next prime is 121751671651. The reversal of 121751671640 is 46176157121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41130842 + ... + 41133801.

Almost surely, 2^121751671640 is an apocalyptic number.

121751671640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121751671640 is an abundant number, since it is smaller than the sum of its proper divisors (159593410840).

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

121751671640 is a wasteful number, since it uses less digits than its factorization.

121751671640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82264691 (or 82264687 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 121751671640 in words is "one hundred twenty-one billion, seven hundred fifty-one million, six hundred seventy-one thousand, six hundred forty".