1221354442 has 32 divisors (see below), whose sum is σ = 2286817920. Its totient is φ = 475284480.

The previous prime is 1221354437. The next prime is 1221354469. The reversal of 1221354442 is 2444531221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221354442.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138798 + ... + 147334.

It is an arithmetic number, because the mean of its divisors is an integer number (71463060).

Almost surely, 2^1221354442 is an apocalyptic number.

1221354442 is a deficient number, since it is larger than the sum of its proper divisors (1065463478).

1221354442 is a wasteful number, since it uses less digits than its factorization.

1221354442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9486.

The product of its digits is 7680, while the sum is 28.

The square root of 1221354442 is about 34947.8817956110. The cubic root of 1221354442 is about 1068.9250105566.

Adding to 1221354442 its reverse (2444531221), we get a palindrome (3665885663).

The spelling of 1221354442 in words is "one billion, two hundred twenty-one million, three hundred fifty-four thousand, four hundred forty-two".