1221220230 has 16 divisors (see below), whose sum is σ = 2930928624. Its totient is φ = 325658720.

The previous prime is 1221220229. The next prime is 1221220271. The reversal of 1221220230 is 320221221.

It is a happy number.

It is a super-2 number, since 2×1221220230² = 2982757700322505800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

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, 20353641 + ... + 20353700.

It is an arithmetic number, because the mean of its divisors is an integer number (183183039).

Almost surely, 2^1221220230 is an apocalyptic number.

1221220230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221220230 is an abundant number, since it is smaller than the sum of its proper divisors (1709708394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221220230 is a wasteful number, since it uses less digits than its factorization.

1221220230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40707351.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1221220230 is about 34945.9615692572. The cubic root of 1221220230 is about 1068.8858551693.

Adding to 1221220230 its reverse (320221221), we get a palindrome (1541441451).

Subtracting from 1221220230 its reverse (320221221), we obtain a palindrome (900999009).

The spelling of 1221220230 in words is "one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred thirty".