1221021233224 has 32 divisors (see below), whose sum is σ = 2550541707000. Its totient is φ = 544115561472.

The previous prime is 1221021233221. The next prime is 1221021233233. The reversal of 1221021233224 is 4223321201221.

It can be written as a sum of positive squares in 4 ways, for example, as 1176465622500 + 44555610724 = 1084650^2 + 211082^2 .

It is not an unprimeable number, because it can be changed into a prime (1221021233221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202420929 + ... + 202426960.

Almost surely, 2^{1221021233224} is an apocalyptic number.

It is an amenable number.

1221021233224 is an abundant number, since it is smaller than the sum of its proper divisors (1329520473776).

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

1221021233224 is a wasteful number, since it uses less digits than its factorization.

1221021233224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404847937 (or 404847933 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 1221021233224 its reverse (4223321201221), we get a palindrome (5444342434445).

The spelling of 1221021233224 in words is "one trillion, two hundred twenty-one billion, twenty-one million, two hundred thirty-three thousand, two hundred twenty-four".