1212212320 has 48 divisors (see below), whose sum is σ = 3124206288. Its totient is φ = 440803840.

The previous prime is 1212212291. The next prime is 1212212321. The reversal of 1212212320 is 232122121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1212212294 and 1212212303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212212321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342619 + ... + 346138.

It is an arithmetic number, because the mean of its divisors is an integer number (65087631).

Almost surely, 2^1212212320 is an apocalyptic number.

1212212320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212212320 is an abundant number, since it is smaller than the sum of its proper divisors (1911993968).

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

1212212320 is a wasteful number, since it uses less digits than its factorization.

1212212320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688783 (or 688775 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1212212320 is about 34816.8396038469. The cubic root of 1212212320 is about 1066.2512774932.

Adding to 1212212320 its reverse (232122121), we get a palindrome (1444334441).

It can be divided in two parts, 12122 and 12320, that added together give a palindrome (24442).

The spelling of 1212212320 in words is "one billion, two hundred twelve million, two hundred twelve thousand, three hundred twenty".