121320624 has 80 divisors (see below), whose sum is σ = 332657280. Its totient is φ = 37992960.

The previous prime is 121320623. The next prime is 121320631. The reversal of 121320624 is 426023121.

It is a self number, because there is not a number n which added to its sum of digits gives 121320624.

It is not an unprimeable number, because it can be changed into a prime (121320623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124459 + ... + 125429.

It is an arithmetic number, because the mean of its divisors is an integer number (4158216).

Almost surely, 2^121320624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121320624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166328640).

121320624 is an abundant number, since it is smaller than the sum of its proper divisors (211336656).

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

121320624 is a wasteful number, since it uses less digits than its factorization.

121320624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138 (or 1132 counting only the distinct ones).

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

The square root of 121320624 is about 11014.5641765800. The cubic root of 121320624 is about 495.0452279866.

Adding to 121320624 its reverse (426023121), we get a palindrome (547343745).

The spelling of 121320624 in words is "one hundred twenty-one million, three hundred twenty thousand, six hundred twenty-four".