1221222024 has 72 divisors (see below), whose sum is σ = 3635516430. Its totient is φ = 370064640.

The previous prime is 1221222019. The next prime is 1221222031. The reversal of 1221222024 is 4202221221.

It can be written as a sum of positive squares in only one way, i.e., 1155320100 + 65901924 = 33990^2 + 8118^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221221988 and 1221222006.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 61377 + ... + 78800.

Almost surely, 2^1221222024 is an apocalyptic number.

It is an amenable number.

1221222024 is an abundant number, since it is smaller than the sum of its proper divisors (2414294406).

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

1221222024 is a wasteful number, since it uses less digits than its factorization.

1221222024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140211 (or 140193 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1221222024 is about 34945.9872374497. The cubic root of 1221222024 is about 1068.8863785748.

Adding to 1221222024 its reverse (4202221221), we get a palindrome (5423443245).

The spelling of 1221222024 in words is "one billion, two hundred twenty-one million, two hundred twenty-two thousand, twenty-four".