1212052116591 has 16 divisors (see below), whose sum is σ = 1795722952800. Its totient is φ = 807994160064.

The previous prime is 1212052116557. The next prime is 1212052116619. The reversal of 1212052116591 is 1956112502121.

1212052116591 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 0 + 52 + 1 + 16 + 591 = 666.

It is not a de Polignac number, because 1212052116591 - 2¹⁷ = 1212051985519 is a prime.

It is a super-2 number, since 2×1212052116591² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212052116511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574896 + ... + 1659701.

It is an arithmetic number, because the mean of its divisors is an integer number (112232684550).

Almost surely, 2^{1212052116591} is an apocalyptic number.

1212052116591 is a deficient number, since it is larger than the sum of its proper divisors (583670836209).

1212052116591 is a wasteful number, since it uses less digits than its factorization.

1212052116591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2254695 (or 2254689 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 36.

The spelling of 1212052116591 in words is "one trillion, two hundred twelve billion, fifty-two million, one hundred sixteen thousand, five hundred ninety-one".