1221005533303 has 8 divisors (see below), whose sum is σ = 1245113121168. Its totient is φ = 1196937565824.

The previous prime is 1221005533271. The next prime is 1221005533309. The reversal of 1221005533303 is 3033355001221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221005533303 - 2⁵ = 1221005533271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221005533309) 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, 9842850 + ... + 9966127.

It is an arithmetic number, because the mean of its divisors is an integer number (155639140146).

Almost surely, 2^{1221005533303} is an apocalyptic number.

1221005533303 is a deficient number, since it is larger than the sum of its proper divisors (24107587865).

1221005533303 is a wasteful number, since it uses less digits than its factorization.

1221005533303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19810193.

The product of its (nonzero) digits is 8100, while the sum is 28.

The spelling of 1221005533303 in words is "one trillion, two hundred twenty-one billion, five million, five hundred thirty-three thousand, three hundred three".