1221442442 has 32 divisors (see below), whose sum is σ = 2028257280. Its totient is φ = 547035120.

The previous prime is 1221442441. The next prime is 1221442447. The reversal of 1221442442 is 2442441221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1221442441) 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, 954359 + ... + 955637.

It is an arithmetic number, because the mean of its divisors is an integer number (63383040).

Almost surely, 2^1221442442 is an apocalyptic number.

1221442442 is a deficient number, since it is larger than the sum of its proper divisors (806814838).

1221442442 is a wasteful number, since it uses less digits than its factorization.

1221442442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898.

The product of its digits is 4096, while the sum is 26.

The square root of 1221442442 is about 34949.1407905831. The cubic root of 1221442442 is about 1068.9506823678.

Adding to 1221442442 its reverse (2442441221), we get a palindrome (3663883663).

The spelling of 1221442442 in words is "one billion, two hundred twenty-one million, four hundred forty-two thousand, four hundred forty-two".