1221346042 has 16 divisors (see below), whose sum is σ = 2138284800. Its totient is φ = 512296848.

The previous prime is 1221346037. The next prime is 1221346051. The reversal of 1221346042 is 2406431221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221345998 and 1221346016.

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, 927417 + ... + 928732.

It is an arithmetic number, because the mean of its divisors is an integer number (133642800).

Almost surely, 2^1221346042 is an apocalyptic number.

1221346042 is a deficient number, since it is larger than the sum of its proper divisors (916938758).

1221346042 is a wasteful number, since it uses less digits than its factorization.

1221346042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856205.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1221346042 is about 34947.7616164469. The cubic root of 1221346042 is about 1068.9225600011.

Adding to 1221346042 its reverse (2406431221), we get a palindrome (3627777263).

The spelling of 1221346042 in words is "one billion, two hundred twenty-one million, three hundred forty-six thousand, forty-two".