1211100101023 has 4 divisors (see below), whose sum is σ = 1211705956000. Its totient is φ = 1210494246048.

The previous prime is 1211100100993. The next prime is 1211100101027. The reversal of 1211100101023 is 3201010011121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211100101023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211100100994 and 1211100101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211100101027) 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, 302924490 + ... + 302928487.

It is an arithmetic number, because the mean of its divisors is an integer number (302926489000).

Almost surely, 2^{1211100101023} is an apocalyptic number.

1211100101023 is a deficient number, since it is larger than the sum of its proper divisors (605854977).

1211100101023 is an equidigital number, since it uses as much as digits as its factorization.

1211100101023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605854976.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 1211100101023 its reverse (3201010011121), we get a palindrome (4412110112144).

The spelling of 1211100101023 in words is "one trillion, two hundred eleven billion, one hundred million, one hundred one thousand, twenty-three".