1213012320 has 192 divisors, whose sum is σ = 4134110400. Its totient is φ = 297197568.

The previous prime is 1213012303. The next prime is 1213012363. The reversal of 1213012320 is 232103121.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1213012320.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2177482 + ... + 2178038.

It is an arithmetic number, because the mean of its divisors is an integer number (21531825).

Almost surely, 2^1213012320 is an apocalyptic number.

1213012320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213012320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2067055200).

1213012320 is an abundant number, since it is smaller than the sum of its proper divisors (2921098080).

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

1213012320 is a wasteful number, since it uses less digits than its factorization.

1213012320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937 (or 929 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1213012320 is about 34828.3264025132. The cubic root of 1213012320 is about 1066.4857835641.

Adding to 1213012320 its reverse (232103121), we get a palindrome (1445115441).

The spelling of 1213012320 in words is "one billion, two hundred thirteen million, twelve thousand, three hundred twenty".