1211100170256 has 60 divisors (see below), whose sum is σ = 3567787790320. Its totient is φ = 382452684480.

The previous prime is 1211100170233. The next prime is 1211100170257. The reversal of 1211100170256 is 6520710011121.

It is a super-2 number, since 2×1211100170256² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211100170257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221324050 + ... + 221329521.

Almost surely, 2^{1211100170256} is an apocalyptic number.

1211100170256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1211100170256 is an abundant number, since it is smaller than the sum of its proper divisors (2356687620064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211100170256 is a wasteful number, since it uses less digits than its factorization.

1211100170256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442653604 (or 442653595 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 27.

Adding to 1211100170256 its reverse (6520710011121), we get a palindrome (7731810181377).

The spelling of 1211100170256 in words is "one trillion, two hundred eleven billion, one hundred million, one hundred seventy thousand, two hundred fifty-six".