1221204403332 has 84 divisors (see below), whose sum is σ = 3282347216316. Its totient is φ = 397139604480.

The previous prime is 1221204403219. The next prime is 1221204403369. The reversal of 1221204403332 is 2333044021221.

1221204403332 is a `hidden beast` number, since 1 + 2 + 21 + 204 + 403 + 3 + 32 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 741279672576 + 479924730756 = 860976^2 + 692766^2 .

It is a super-2 number, since 2×1221204403332² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1221204403296 and 1221204403305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 4987693 + ... + 5226804.

It is an arithmetic number, because the mean of its divisors is an integer number (39075562099).

Almost surely, 2^{1221204403332} is an apocalyptic number.

1221204403332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221204403332 is an abundant number, since it is smaller than the sum of its proper divisors (2061142812984).

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

1221204403332 is a wasteful number, since it uses less digits than its factorization.

1221204403332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10214560 (or 10214543 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 1221204403332 its reverse (2333044021221), we get a palindrome (3554248424553).

The spelling of 1221204403332 in words is "one trillion, two hundred twenty-one billion, two hundred four million, four hundred three thousand, three hundred thirty-two".