1221253242 has 96 divisors (see below), whose sum is σ = 2897850816. Its totient is φ = 341552640.

The previous prime is 1221253211. The next prime is 1221253343. The reversal of 1221253242 is 2423521221.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 653193 + ... + 655059.

It is an arithmetic number, because the mean of its divisors is an integer number (30185946).

Almost surely, 2^1221253242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221253242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1448925408).

1221253242 is an abundant number, since it is smaller than the sum of its proper divisors (1676597574).

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

1221253242 is a wasteful number, since it uses less digits than its factorization.

1221253242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964 (or 1953 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 1221253242 is about 34946.4338953204. The cubic root of 1221253242 is about 1068.8954864493.

Adding to 1221253242 its reverse (2423521221), we get a palindrome (3644774463).

The spelling of 1221253242 in words is "one billion, two hundred twenty-one million, two hundred fifty-three thousand, two hundred forty-two".