1221234442 has 16 divisors (see below), whose sum is σ = 1851776640. Its totient is φ = 603993088.

The previous prime is 1221234439. The next prime is 1221234449. The reversal of 1221234442 is 2444321221.

It is not an unprimeable number, because it can be changed into a prime (1221234449) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 149898 + ... + 157834.

It is an arithmetic number, because the mean of its divisors is an integer number (115736040).

Almost surely, 2^1221234442 is an apocalyptic number.

1221234442 is a deficient number, since it is larger than the sum of its proper divisors (630542198).

1221234442 is a wasteful number, since it uses less digits than its factorization.

1221234442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8765.

The product of its digits is 3072, while the sum is 25.

The square root of 1221234442 is about 34946.1649111888. The cubic root of 1221234442 is about 1068.8900015541.

Adding to 1221234442 its reverse (2444321221), we get a palindrome (3665555663).

The spelling of 1221234442 in words is "one billion, two hundred twenty-one million, two hundred thirty-four thousand, four hundred forty-two".