211121001305 has 4 divisors (see below), whose sum is σ = 253345201572. Its totient is φ = 168896801040.

The previous prime is 211121001269. The next prime is 211121001313. The reversal of 211121001305 is 503100121112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 124539115801 + 86581885504 = 352901^2 + 294248^2 .

It is not a de Polignac number, because 211121001305 - 2³⁰ = 210047259481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21112100126 + ... + 21112100135.

It is an arithmetic number, because the mean of its divisors is an integer number (63336300393).

Almost surely, 2^211121001305 is an apocalyptic number.

It is an amenable number.

211121001305 is a deficient number, since it is larger than the sum of its proper divisors (42224200267).

211121001305 is an equidigital number, since it uses as much as digits as its factorization.

211121001305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42224200266.

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 211121001305 its reverse (503100121112), we get a palindrome (714221122417).

The spelling of 211121001305 in words is "two hundred eleven billion, one hundred twenty-one million, one thousand, three hundred five".