1221310442 has 16 divisors (see below), whose sum is σ = 2085400512. Its totient is φ = 531004320.

The previous prime is 1221310423. The next prime is 1221310469. The reversal of 1221310442 is 2440131221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1206323 + ... + 1207334.

It is an arithmetic number, because the mean of its divisors is an integer number (130337532).

Almost surely, 2^1221310442 is an apocalyptic number.

1221310442 is a deficient number, since it is larger than the sum of its proper divisors (864090070).

1221310442 is a wasteful number, since it uses less digits than its factorization.

1221310442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413693.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1221310442 is about 34947.2522811165. The cubic root of 1221310442 is about 1068.9121741886.

Adding to 1221310442 its reverse (2440131221), we get a palindrome (3661441663).

The spelling of 1221310442 in words is "one billion, two hundred twenty-one million, three hundred ten thousand, four hundred forty-two".