1221213313333 has 8 divisors (see below), whose sum is σ = 1315166513976. Its totient is φ = 1127262072000.

The previous prime is 1221213313261. The next prime is 1221213313339. The reversal of 1221213313333 is 3333133121221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 265984653169 + 955228660164 = 515737^2 + 977358^2 .

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 1221213313333 - 2⁹ = 1221213312821 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 (1221213313339) 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, 964683 + ... + 1836583.

It is an arithmetic number, because the mean of its divisors is an integer number (164395814247).

Almost surely, 2^{1221213313333} is an apocalyptic number.

1221213313333 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1221213313333 is a deficient number, since it is larger than the sum of its proper divisors (93953200643).

1221213313333 is a wasteful number, since it uses less digits than its factorization.

1221213313333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979655.

The product of its digits is 5832, while the sum is 28.

Adding to 1221213313333 its reverse (3333133121221), we get a palindrome (4554346434554).

The spelling of 1221213313333 in words is "one trillion, two hundred twenty-one billion, two hundred thirteen million, three hundred thirteen thousand, three hundred thirty-three".