1221030345 has 16 divisors (see below), whose sum is σ = 2056472640. Its totient is φ = 616941504.

The previous prime is 1221030331. The next prime is 1221030359. The reversal of 1221030345 is 5430301221.

It is an interprime number because it is at equal distance from previous prime (1221030331) and next prime (1221030359).

It is not a de Polignac number, because 1221030345 - 2⁴ = 1221030329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2141874 + ... + 2142443.

It is an arithmetic number, because the mean of its divisors is an integer number (128529540).

Almost surely, 2^1221030345 is an apocalyptic number.

1221030345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221030345 is a deficient number, since it is larger than the sum of its proper divisors (835442295).

1221030345 is a wasteful number, since it uses less digits than its factorization.

1221030345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4284344.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1221030345 is about 34943.2446261076. The cubic root of 1221030345 is about 1068.8304526830.

Adding to 1221030345 its reverse (5430301221), we get a palindrome (6651331566).

The spelling of 1221030345 in words is "one billion, two hundred twenty-one million, thirty thousand, three hundred forty-five".