211232253561 has 16 divisors (see below), whose sum is σ = 322099292544. Its totient is φ = 120621055104.

The previous prime is 211232253473. The next prime is 211232253563. The reversal of 211232253561 is 165352232112.

It is not a de Polignac number, because 211232253561 - 2⁷ = 211232253433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211232253563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3430836 + ... + 3491861.

It is an arithmetic number, because the mean of its divisors is an integer number (20131205784).

Almost surely, 2^211232253561 is an apocalyptic number.

211232253561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211232253561 is a deficient number, since it is larger than the sum of its proper divisors (110867038983).

211232253561 is a wasteful number, since it uses less digits than its factorization.

211232253561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6924160.

The product of its digits is 21600, while the sum is 33.

Adding to 211232253561 its reverse (165352232112), we get a palindrome (376584485673).

The spelling of 211232253561 in words is "two hundred eleven billion, two hundred thirty-two million, two hundred fifty-three thousand, five hundred sixty-one".