121789720 has 32 divisors (see below), whose sum is σ = 295107120. Its totient is φ = 44968320.

The previous prime is 121789699. The next prime is 121789727. The reversal of 121789720 is 27987121.

It is a self number, because there is not a number n which added to its sum of digits gives 121789720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121789727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116586 + ... + 117625.

Almost surely, 2^121789720 is an apocalyptic number.

121789720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121789720 is an abundant number, since it is smaller than the sum of its proper divisors (173317400).

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

121789720 is a wasteful number, since it uses less digits than its factorization.

121789720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234235 (or 234231 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 121789720 is about 11035.8379835878. The cubic root of 121789720 is about 495.6824515296.

The spelling of 121789720 in words is "one hundred twenty-one million, seven hundred eighty-nine thousand, seven hundred twenty".