211452441505 has 4 divisors (see below), whose sum is σ = 253742929812. Its totient is φ = 169161953200.

The previous prime is 211452441479. The next prime is 211452441509. The reversal of 211452441505 is 505144254112.

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 74073242896 + 137379198609 = 272164^2 + 370647^2 .

It is not a de Polignac number, because 211452441505 - 2¹⁹ = 211451917217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211452441509) 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, 21145244146 + ... + 21145244155.

It is an arithmetic number, because the mean of its divisors is an integer number (63435732453).

Almost surely, 2^211452441505 is an apocalyptic number.

It is an amenable number.

211452441505 is a deficient number, since it is larger than the sum of its proper divisors (42290488307).

211452441505 is an equidigital number, since it uses as much as digits as its factorization.

211452441505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42290488306.

The product of its (nonzero) digits is 32000, while the sum is 34.

Adding to 211452441505 its reverse (505144254112), we get a palindrome (716596695617).

The spelling of 211452441505 in words is "two hundred eleven billion, four hundred fifty-two million, four hundred forty-one thousand, five hundred five".