1211221310434 has 4 divisors (see below), whose sum is σ = 1816831965654. Its totient is φ = 605610655216.

The previous prime is 1211221310389. The next prime is 1211221310489. The reversal of 1211221310434 is 4340131221121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1043656344025 + 167564966409 = 1021595^2 + 409347^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1211221310399 and 1211221310408.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 302805327607 + ... + 302805327610.

Almost surely, 2^{1211221310434} is an apocalyptic number.

1211221310434 is a deficient number, since it is larger than the sum of its proper divisors (605610655220).

1211221310434 is an equidigital number, since it uses as much as digits as its factorization.

1211221310434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605610655219.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 1211221310434 its reverse (4340131221121), we get a palindrome (5551352531555).

The spelling of 1211221310434 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, three hundred ten thousand, four hundred thirty-four".