1212221430 has 64 divisors (see below), whose sum is σ = 3694394880. Its totient is φ = 277078752.

The previous prime is 1212221401. The next prime is 1212221447. The reversal of 1212221430 is 341222121.

It is a happy number.

1212221430 is a `hidden beast` number, since 1 + 2 + 12 + 221 + 430 = 666.

It is a super-3 number, since 3×1212221430³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 318804 + ... + 322583.

It is an arithmetic number, because the mean of its divisors is an integer number (57724920).

Almost surely, 2^1212221430 is an apocalyptic number.

1212221430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212221430 is an abundant number, since it is smaller than the sum of its proper divisors (2482173450).

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

1212221430 is a wasteful number, since it uses less digits than its factorization.

1212221430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641410 (or 641404 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1212221430 is about 34816.9704310987. The cubic root of 1212221430 is about 1066.2539485118.

Adding to 1212221430 its reverse (341222121), we get a palindrome (1553443551).

The spelling of 1212221430 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, four hundred thirty".