1221403330 has 16 divisors (see below), whose sum is σ = 2512601280. Its totient is φ = 418766832.

The previous prime is 1221403321. The next prime is 1221403333. The reversal of 1221403330 is 333041221.

It is a junction number, because it is equal to n+sod(n) for n = 1221403298 and 1221403307.

It is not an unprimeable number, because it can be changed into a prime (1221403333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8724240 + ... + 8724379.

It is an arithmetic number, because the mean of its divisors is an integer number (157037580).

Almost surely, 2^1221403330 is an apocalyptic number.

1221403330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221403330 is an abundant number, since it is smaller than the sum of its proper divisors (1291197950).

1221403330 is a wasteful number, since it uses less digits than its factorization.

1221403330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17448633.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1221403330 is about 34948.5812301444. The cubic root of 1221403330 is about 1068.9392725669.

Adding to 1221403330 its reverse (333041221), we get a palindrome (1554444551).

The spelling of 1221403330 in words is "one billion, two hundred twenty-one million, four hundred three thousand, three hundred thirty".