1221120230 has 16 divisors (see below), whose sum is σ = 2397836304. Its totient is φ = 444043680.

The previous prime is 1221120211. The next prime is 1221120233. The reversal of 1221120230 is 320211221.

It is a happy number.

It is a super-2 number, since 2×1221120230² = 2982269232230505800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221120233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5550437 + ... + 5550656.

It is an arithmetic number, because the mean of its divisors is an integer number (149864769).

Almost surely, 2^1221120230 is an apocalyptic number.

1221120230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221120230 is a deficient number, since it is larger than the sum of its proper divisors (1176716074).

1221120230 is a wasteful number, since it uses less digits than its factorization.

1221120230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11101111.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1221120230 is about 34944.5307594765. The cubic root of 1221120230 is about 1068.8566790222.

Adding to 1221120230 its reverse (320211221), we get a palindrome (1541331451).

Subtracting from 1221120230 its reverse (320211221), we obtain a palindrome (900909009).

The spelling of 1221120230 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, two hundred thirty".