121561751670 has 64 divisors (see below), whose sum is σ = 307182240000. Its totient is φ = 30702450816.

The previous prime is 121561751657. The next prime is 121561751671. The reversal of 121561751670 is 76157165121.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121561751671) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2379556 + ... + 2430104.

It is an arithmetic number, because the mean of its divisors is an integer number (4799722500).

Almost surely, 2^121561751670 is an apocalyptic number.

121561751670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121561751670 is an abundant number, since it is smaller than the sum of its proper divisors (185620488330).

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

121561751670 is a wasteful number, since it uses less digits than its factorization.

121561751670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54797.

The product of its (nonzero) digits is 88200, while the sum is 42.

The spelling of 121561751670 in words is "one hundred twenty-one billion, five hundred sixty-one million, seven hundred fifty-one thousand, six hundred seventy".