1212122320 has 40 divisors (see below), whose sum is σ = 2909099520. Its totient is φ = 469207680.

The previous prime is 1212122297. The next prime is 1212122323. The reversal of 1212122320 is 232212121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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 = 1212122294 and 1212122303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212122323) 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, 241900 + ... + 246859.

It is an arithmetic number, because the mean of its divisors is an integer number (72727488).

Almost surely, 2^1212122320 is an apocalyptic number.

1212122320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212122320 is an abundant number, since it is smaller than the sum of its proper divisors (1696977200).

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

1212122320 is a wasteful number, since it uses less digits than its factorization.

1212122320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488803 (or 488797 counting only the distinct ones).

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

The square root of 1212122320 is about 34815.5471018337. The cubic root of 1212122320 is about 1066.2248891044.

Adding to 1212122320 its reverse (232212121), we get a palindrome (1444334441).

The spelling of 1212122320 in words is "one billion, two hundred twelve million, one hundred twenty-two thousand, three hundred twenty".