1211123013101 has 4 divisors (see below), whose sum is σ = 1274866329600. Its totient is φ = 1147379696604.

The previous prime is 1211123013031. The next prime is 1211123013103. The reversal of 1211123013101 is 1013103211121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211123013101 - 2³⁸ = 936245106157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211123013101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211123013103) 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, 31871658221 + ... + 31871658258.

It is an arithmetic number, because the mean of its divisors is an integer number (318716582400).

Almost surely, 2^{1211123013101} is an apocalyptic number.

It is an amenable number.

1211123013101 is a deficient number, since it is larger than the sum of its proper divisors (63743316499).

1211123013101 is an equidigital number, since it uses as much as digits as its factorization.

1211123013101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63743316498.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 1211123013101 its reverse (1013103211121), we get a palindrome (2224226224222).

The spelling of 1211123013101 in words is "one trillion, two hundred eleven billion, one hundred twenty-three million, thirteen thousand, one hundred one".