121221023424 has 112 divisors (see below), whose sum is σ = 329137670400. Its totient is φ = 39353287680.

The previous prime is 121221023393. The next prime is 121221023459. The reversal of 121221023424 is 424320122121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 121221023394 and 121221023403.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2860309 + ... + 2902379.

It is an arithmetic number, because the mean of its divisors is an integer number (2938729200).

Almost surely, 2^121221023424 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 121221023424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164568835200).

121221023424 is an abundant number, since it is smaller than the sum of its proper divisors (207916646976).

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

121221023424 is a wasteful number, since it uses less digits than its factorization.

121221023424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42478 (or 42468 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 121221023424 its reverse (424320122121), we get a palindrome (545541145545).

The spelling of 121221023424 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty-three thousand, four hundred twenty-four".