1211212230320 has 20 divisors (see below), whose sum is σ = 2816068435680. Its totient is φ = 484484892096.

The previous prime is 1211212230313. The next prime is 1211212230331. The reversal of 1211212230320 is 230322121121.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1211212230292 and 1211212230301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7570076360 + ... + 7570076519.

It is an arithmetic number, because the mean of its divisors is an integer number (140803421784).

Almost surely, 2^{1211212230320} is an apocalyptic number.

1211212230320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211212230320 is an abundant number, since it is smaller than the sum of its proper divisors (1604856205360).

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

1211212230320 is a wasteful number, since it uses less digits than its factorization.

1211212230320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15140152892 (or 15140152886 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1211212230320 its reverse (230322121121), we get a palindrome (1441534351441).

The spelling of 1211212230320 in words is "one trillion, two hundred eleven billion, two hundred twelve million, two hundred thirty thousand, three hundred twenty".