1221333133333 has 2 divisors, whose sum is σ = 1221333133334. Its totient is φ = 1221333133332.

The previous prime is 1221333133303. The next prime is 1221333133373. The reversal of 1221333133333 is 3333313331221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 918649405444 + 302683727889 = 958462^2 + 550167^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221333133333 - 2¹³ = 1221333125141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221333133295 and 1221333133304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221333133303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610666566666 + 610666566667.

It is an arithmetic number, because the mean of its divisors is an integer number (610666566667).

Almost surely, 2^{1221333133333} is an apocalyptic number.

It is an amenable number.

1221333133333 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221333133333 is an equidigital number, since it uses as much as digits as its factorization.

1221333133333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 31.

Adding to 1221333133333 its reverse (3333313331221), we get a palindrome (4554646464554).

The spelling of 1221333133333 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-three million, one hundred thirty-three thousand, three hundred thirty-three".