1221003333333 has 16 divisors (see below), whose sum is σ = 2067307231360. Its totient is φ = 697716190368.

The previous prime is 1221003333317. The next prime is 1221003333391. The reversal of 1221003333333 is 3333333001221.

It is not a de Polignac number, because 1221003333333 - 2⁴ = 1221003333317 is a prime.

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

1221003333333 is a modest number, since divided by 3333333 gives 122100 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1221003333297 and 1221003333306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221003331333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3230167360 + ... + 3230167737.

It is an arithmetic number, because the mean of its divisors is an integer number (129206701960).

Almost surely, 2^{1221003333333} is an apocalyptic number.

It is an amenable number.

1221003333333 is a deficient number, since it is larger than the sum of its proper divisors (846303898027).

1221003333333 is an equidigital number, since it uses as much as digits as its factorization.

1221003333333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6460335113 (or 6460335107 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 27.

Adding to 1221003333333 its reverse (3333333001221), we get a palindrome (4554336334554).

The spelling of 1221003333333 in words is "one trillion, two hundred twenty-one billion, three million, three hundred thirty-three thousand, three hundred thirty-three".