121232730 has 64 divisors (see below), whose sum is σ = 312128640. Its totient is φ = 30041856.

The previous prime is 121232707. The next prime is 121232737. The reversal of 121232730 is 37232121.

It is a junction number, because it is equal to n+sod(n) for n = 121232697 and 121232706.

It is not an unprimeable number, because it can be changed into a prime (121232737) 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, 28204 + ... + 32216.

It is an arithmetic number, because the mean of its divisors is an integer number (4877010).

Almost surely, 2^121232730 is an apocalyptic number.

121232730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121232730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156064320).

121232730 is an abundant number, since it is smaller than the sum of its proper divisors (190895910).

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

121232730 is a wasteful number, since it uses less digits than its factorization.

121232730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4095.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 121232730 is about 11010.5735545429. The cubic root of 121232730 is about 494.9256494798.

Adding to 121232730 its reverse (37232121), we get a palindrome (158464851).

The spelling of 121232730 in words is "one hundred twenty-one million, two hundred thirty-two thousand, seven hundred thirty".