211215441305 has 16 divisors (see below), whose sum is σ = 276569506944. Its totient is φ = 153572734080.

The previous prime is 211215441277. The next prime is 211215441347. The reversal of 211215441305 is 503144512112.

It is a happy number.

It is not a de Polignac number, because 211215441305 - 2²⁰ = 211214392729 is a prime.

It is a super-2 number, since 2×211215441305² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258812 + ... + 699581.

It is an arithmetic number, because the mean of its divisors is an integer number (17285594184).

Almost surely, 2^211215441305 is an apocalyptic number.

It is an amenable number.

211215441305 is a deficient number, since it is larger than the sum of its proper divisors (65354065639).

211215441305 is a wasteful number, since it uses less digits than its factorization.

211215441305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962416.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 211215441305 its reverse (503144512112), we get a palindrome (714359953417).

The spelling of 211215441305 in words is "two hundred eleven billion, two hundred fifteen million, four hundred forty-one thousand, three hundred five".