1211705011516 has 12 divisors (see below), whose sum is σ = 2188886472640. Its totient is φ = 586308876480.

The previous prime is 1211705011507. The next prime is 1211705011519. The reversal of 1211705011516 is 6151105071121.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211705011519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4885907181 + ... + 4885907428.

Almost surely, 2^{1211705011516} is an apocalyptic number.

It is an amenable number.

1211705011516 is a deficient number, since it is larger than the sum of its proper divisors (977181461124).

1211705011516 is a wasteful number, since it uses less digits than its factorization.

1211705011516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9771814644 (or 9771814642 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 31.

The spelling of 1211705011516 in words is "one trillion, two hundred eleven billion, seven hundred five million, eleven thousand, five hundred sixteen".