121347720 has 320 divisors, whose sum is σ = 456160320. Its totient is φ = 28740096.

The previous prime is 121347703. The next prime is 121347731. The reversal of 121347720 is 27743121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1811127 + ... + 1811193.

It is an arithmetic number, because the mean of its divisors is an integer number (1425501).

Almost surely, 2^121347720 is an apocalyptic number.

121347720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121347720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228080160).

121347720 is an abundant number, since it is smaller than the sum of its proper divisors (334812600).

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

121347720 is a wasteful number, since it uses less digits than its factorization.

121347720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 121347720 is about 11015.7941157231. The cubic root of 121347720 is about 495.0820800528.

The spelling of 121347720 in words is "one hundred twenty-one million, three hundred forty-seven thousand, seven hundred twenty".