1221320030 has 32 divisors (see below), whose sum is σ = 2513730240. Its totient is φ = 418521600.

The previous prime is 1221320029. The next prime is 1221320041. The reversal of 1221320030 is 300231221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1221319987 and 1221320014.

It is a congruent number.

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, 192956 + ... + 199184.

It is an arithmetic number, because the mean of its divisors is an integer number (78554070).

Almost surely, 2^1221320030 is an apocalyptic number.

1221320030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221320030 is an abundant number, since it is smaller than the sum of its proper divisors (1292410210).

1221320030 is a wasteful number, since it uses less digits than its factorization.

1221320030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9044.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1221320030 is about 34947.3894590140. The cubic root of 1221320030 is about 1068.9149713762.

Adding to 1221320030 its reverse (300231221), we get a palindrome (1521551251).

The spelling of 1221320030 in words is "one billion, two hundred twenty-one million, three hundred twenty thousand, thirty".