1221124242 has 16 divisors (see below), whose sum is σ = 2630113920. Its totient is φ = 375730512.

The previous prime is 1221124237. The next prime is 1221124253. The reversal of 1221124242 is 2424211221.

It is a super-2 number, since 2×1221124242² = 2982288828800149128, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7827642 + ... + 7827797.

It is an arithmetic number, because the mean of its divisors is an integer number (164382120).

Almost surely, 2^1221124242 is an apocalyptic number.

1221124242 is an abundant number, since it is smaller than the sum of its proper divisors (1408989678).

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

1221124242 is a wasteful number, since it uses less digits than its factorization.

1221124242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15655457.

The product of its digits is 512, while the sum is 21.

The square root of 1221124242 is about 34944.5881646930. The cubic root of 1221124242 is about 1068.8578495999.

Adding to 1221124242 its reverse (2424211221), we get a palindrome (3645335463).

The spelling of 1221124242 in words is "one billion, two hundred twenty-one million, one hundred twenty-four thousand, two hundred forty-two".