1221033635224 has 48 divisors (see below), whose sum is σ = 2479413234600. Its totient is φ = 563481794304.

The previous prime is 1221033635221. The next prime is 1221033635317. The reversal of 1221033635224 is 4225363301221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221033635224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221033635221) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 11328852 + ... + 11436124.

Almost surely, 2^{1221033635224} is an apocalyptic number.

It is an amenable number.

1221033635224 is an abundant number, since it is smaller than the sum of its proper divisors (1258379599376).

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

1221033635224 is a wasteful number, since it uses less digits than its factorization.

1221033635224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115724 (or 115707 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 1221033635224 its reverse (4225363301221), we get a palindrome (5446396936445).

The spelling of 1221033635224 in words is "one trillion, two hundred twenty-one billion, thirty-three million, six hundred thirty-five thousand, two hundred twenty-four".