121720753670 has 64 divisors (see below), whose sum is σ = 228023437824. Its totient is φ = 46748378880.

The previous prime is 121720753667. The next prime is 121720753681. The reversal of 121720753670 is 76357027121.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 6874649 + ... + 6892331.

It is an arithmetic number, because the mean of its divisors is an integer number (3562866216).

Almost surely, 2^121720753670 is an apocalyptic number.

121720753670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121720753670 is a deficient number, since it is larger than the sum of its proper divisors (106302684154).

121720753670 is a wasteful number, since it uses less digits than its factorization.

121720753670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17997.

The product of its (nonzero) digits is 123480, while the sum is 41.

The spelling of 121720753670 in words is "one hundred twenty-one billion, seven hundred twenty million, seven hundred fifty-three thousand, six hundred seventy".