1212331320 has 64 divisors (see below), whose sum is σ = 4041108000. Its totient is φ = 323288064.

The previous prime is 1212331297. The next prime is 1212331339. The reversal of 1212331320 is 231332121.

1212331320 is a `hidden beast` number, since 1 + 2 + 12 + 331 + 320 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1212331293 and 1212331302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560185 + ... + 562344.

Almost surely, 2^1212331320 is an apocalyptic number.

1212331320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212331320 is an abundant number, since it is smaller than the sum of its proper divisors (2828776680).

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

1212331320 is a wasteful number, since it uses less digits than its factorization.

1212331320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122549 (or 1122539 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1212331320 is about 34818.5485050713. The cubic root of 1212331320 is about 1066.2861668021.

Adding to 1212331320 its reverse (231332121), we get a palindrome (1443663441).

The spelling of 1212331320 in words is "one billion, two hundred twelve million, three hundred thirty-one thousand, three hundred twenty".