1212511705357 has 4 divisors (see below), whose sum is σ = 1212522383836. Its totient is φ = 1212501026880.

The previous prime is 1212511705351. The next prime is 1212511705459. The reversal of 1212511705357 is 7535071152121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 415671615076 + 796840090281 = 644726^2 + 892659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212511705357 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 (1212511705351) 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 3 ways as a sum of consecutive naturals, for example, 5167068 + ... + 5396629.

It is an arithmetic number, because the mean of its divisors is an integer number (303130595959).

Almost surely, 2^{1212511705357} is an apocalyptic number.

It is an amenable number.

1212511705357 is a deficient number, since it is larger than the sum of its proper divisors (10678479).

1212511705357 is a wasteful number, since it uses less digits than its factorization.

1212511705357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10678478.

The product of its (nonzero) digits is 73500, while the sum is 40.

Adding to 1212511705357 its reverse (7535071152121), we get a palindrome (8747582857478).

The spelling of 1212511705357 in words is "one trillion, two hundred twelve billion, five hundred eleven million, seven hundred five thousand, three hundred fifty-seven".