1211012346655 has 4 divisors (see below), whose sum is σ = 1453214815992. Its totient is φ = 968809877320.

The previous prime is 1211012346653. The next prime is 1211012346707. The reversal of 1211012346655 is 5566432101121.

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

It is not a de Polignac number, because 1211012346655 - 2¹ = 1211012346653 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 (1211012346653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121101234661 + ... + 121101234670.

It is an arithmetic number, because the mean of its divisors is an integer number (363303703998).

Almost surely, 2^{1211012346655} is an apocalyptic number.

1211012346655 is a deficient number, since it is larger than the sum of its proper divisors (242202469337).

1211012346655 is an equidigital number, since it uses as much as digits as its factorization.

1211012346655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242202469336.

The product of its (nonzero) digits is 43200, while the sum is 37.

Adding to 1211012346655 its reverse (5566432101121), we get a palindrome (6777444447776).

The spelling of 1211012346655 in words is "one trillion, two hundred eleven billion, twelve million, three hundred forty-six thousand, six hundred fifty-five".