1221404330 has 16 divisors (see below), whose sum is σ = 2199436200. Its totient is φ = 488359872.

The previous prime is 1221404329. The next prime is 1221404383. The reversal of 1221404330 is 334041221.

It can be written as a sum of positive squares in 4 ways, for example, as 1008507049 + 212897281 = 31757^2 + 14591^2 .

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, 1532 + ... + 49448.

Almost surely, 2^1221404330 is an apocalyptic number.

1221404330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221404330 is a deficient number, since it is larger than the sum of its proper divisors (978031870).

1221404330 is a wasteful number, since it uses less digits than its factorization.

1221404330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50473.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1221404330 is about 34948.5955368739. The cubic root of 1221404330 is about 1068.9395642911.

Adding to 1221404330 its reverse (334041221), we get a palindrome (1555445551).

The spelling of 1221404330 in words is "one billion, two hundred twenty-one million, four hundred four thousand, three hundred thirty".