1211212013333 has 6 divisors (see below), whose sum is σ = 1408960913526. Its totient is φ = 1038181725672.

The previous prime is 1211212013329. The next prime is 1211212013351. The reversal of 1211212013333 is 3333102121121.

It can be written as a sum of positive squares in only one way, i.e., 1019934366724 + 191277646609 = 1009918^2 + 437353^2 .

It is not a de Polignac number, because 1211212013333 - 2² = 1211212013329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211212013299 and 1211212013308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211212013353) 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 5 ways as a sum of consecutive naturals, for example, 12359306210 + ... + 12359306307.

It is an arithmetic number, because the mean of its divisors is an integer number (234826818921).

Almost surely, 2^{1211212013333} is an apocalyptic number.

It is an amenable number.

1211212013333 is a deficient number, since it is larger than the sum of its proper divisors (197748900193).

1211212013333 is an equidigital number, since it uses as much as digits as its factorization.

1211212013333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24718612531 (or 24718612524 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1211212013333 its reverse (3333102121121), we get a palindrome (4544314134454).

The spelling of 1211212013333 in words is "one trillion, two hundred eleven billion, two hundred twelve million, thirteen thousand, three hundred thirty-three".