211255211615 has 16 divisors (see below), whose sum is σ = 289729198080. Its totient is φ = 144856834080.

The previous prime is 211255211603. The next prime is 211255211641. The reversal of 211255211615 is 516112552112.

It is not a de Polignac number, because 211255211615 - 2⁴ = 211255211599 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1991570 + ... + 2094960.

It is an arithmetic number, because the mean of its divisors is an integer number (18108074880).

Almost surely, 2^211255211615 is an apocalyptic number.

211255211615 is a deficient number, since it is larger than the sum of its proper divisors (78473986465).

211255211615 is a wasteful number, since it uses less digits than its factorization.

211255211615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161782.

The product of its digits is 6000, while the sum is 32.

Adding to 211255211615 its reverse (516112552112), we get a palindrome (727367763727).

The spelling of 211255211615 in words is "two hundred eleven billion, two hundred fifty-five million, two hundred eleven thousand, six hundred fifteen".