1211012111101 has 4 divisors (see below), whose sum is σ = 1304166888892. Its totient is φ = 1117857333312.

The previous prime is 1211012111053. The next prime is 1211012111149. The reversal of 1211012111101 is 1011112101121.

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

It is an interprime number because it is at equal distance from previous prime (1211012111053) and next prime (1211012111149).

It can be written as a sum of positive squares in 2 ways, for example, as 813109779076 + 397902332025 = 901726^2 + 630795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211012111101 - 2⁹ = 1211012110589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 93154777777 = 1211012111101 / (1 + 2 + 1 + 1 + 0 + 1 + 2 + 1 + 1 + 1 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211012111161) 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, 46577388876 + ... + 46577388901.

It is an arithmetic number, because the mean of its divisors is an integer number (326041722223).

Almost surely, 2^{1211012111101} is an apocalyptic number.

It is an amenable number.

1211012111101 is a deficient number, since it is larger than the sum of its proper divisors (93154777791).

1211012111101 is an equidigital number, since it uses as much as digits as its factorization.

1211012111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93154777790.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1211012111101 its reverse (1011112101121), we get a palindrome (2222124212222).

The spelling of 1211012111101 in words is "one trillion, two hundred eleven billion, twelve million, one hundred eleven thousand, one hundred one".