1221020323232 has 48 divisors (see below), whose sum is σ = 2552582176200. Its totient is φ = 572951298048.

The previous prime is 1221020323207. The next prime is 1221020323273. The reversal of 1221020323232 is 2323230201221.

It can be written as a sum of positive squares in 4 ways, for example, as 1134727735696 + 86292587536 = 1065236^2 + 293756^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221020323198 and 1221020323207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3025793 + ... + 3405504.

Almost surely, 2^{1221020323232} is an apocalyptic number.

It is an amenable number.

1221020323232 is an abundant number, since it is smaller than the sum of its proper divisors (1331561852968).

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

1221020323232 is a wasteful number, since it uses less digits than its factorization.

1221020323232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6431673 (or 6431665 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 1221020323232 its reverse (2323230201221), we get a palindrome (3544250524453).

The spelling of 1221020323232 in words is "one trillion, two hundred twenty-one billion, twenty million, three hundred twenty-three thousand, two hundred thirty-two".