1221120024 has 64 divisors (see below), whose sum is σ = 3127238400. Its totient is φ = 397229184.

The previous prime is 1221120011. The next prime is 1221120029. The reversal of 1221120024 is 4200211221.

It is a super-2 number, since 2×1221120024² = 2982268226027521152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221119985 and 1221120012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221120029) 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, 171789 + ... + 178755.

It is an arithmetic number, because the mean of its divisors is an integer number (48863100).

Almost surely, 2^1221120024 is an apocalyptic number.

It is an amenable number.

1221120024 is an abundant number, since it is smaller than the sum of its proper divisors (1906118376).

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

1221120024 is a wasteful number, since it uses less digits than its factorization.

1221120024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7152 (or 7148 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1221120024 is about 34944.5278119479. The cubic root of 1221120024 is about 1068.8566189177.

Adding to 1221120024 its reverse (4200211221), we get a palindrome (5421331245).

The spelling of 1221120024 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, twenty-four".