121620432 has 80 divisors (see below), whose sum is σ = 333103680. Its totient is φ = 38169600.

The previous prime is 121620419. The next prime is 121620439. The reversal of 121620432 is 234026121.

It is a junction number, because it is equal to n+sod(n) for n = 121620399 and 121620408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121620439) 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 15 ways as a sum of consecutive naturals, for example, 56007 + ... + 58137.

It is an arithmetic number, because the mean of its divisors is an integer number (4163796).

Almost surely, 2^121620432 is an apocalyptic number.

121620432 is a gapful number since it is divisible by the number (12) 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 121620432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166551840).

121620432 is an abundant number, since it is smaller than the sum of its proper divisors (211483248).

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

121620432 is a wasteful number, since it uses less digits than its factorization.

121620432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212 (or 2206 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 121620432 is about 11028.1653959305. The cubic root of 121620432 is about 495.4526784401.

Adding to 121620432 its reverse (234026121), we get a palindrome (355646553).

The spelling of 121620432 in words is "one hundred twenty-one million, six hundred twenty thousand, four hundred thirty-two".