1221430242 has 16 divisors (see below), whose sum is σ = 2459040192. Its totient is φ = 404446800.

The previous prime is 1221430201. The next prime is 1221430289. The reversal of 1221430242 is 2420341221.

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, 673173 + ... + 674984.

It is an arithmetic number, because the mean of its divisors is an integer number (153690012).

Almost surely, 2^1221430242 is an apocalyptic number.

1221430242 is an abundant number, since it is smaller than the sum of its proper divisors (1237609950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221430242 is a wasteful number, since it uses less digits than its factorization.

1221430242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348313.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1221430242 is about 34948.9662508063. The cubic root of 1221430242 is about 1068.9471233949.

Adding to 1221430242 its reverse (2420341221), we get a palindrome (3641771463).

The spelling of 1221430242 in words is "one billion, two hundred twenty-one million, four hundred thirty thousand, two hundred forty-two".