211523121255 has 16 divisors (see below), whose sum is σ = 347583940704. Its totient is φ = 109763349120.

The previous prime is 211523121223. The next prime is 211523121263. The reversal of 211523121255 is 552121325112.

It is not a de Polignac number, because 211523121255 - 2⁵ = 211523121223 is a prime.

It is a congruent 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, 190560816 + ... + 190561925.

It is an arithmetic number, because the mean of its divisors is an integer number (21723996294).

Almost surely, 2^211523121255 is an apocalyptic number.

211523121255 is a deficient number, since it is larger than the sum of its proper divisors (136060819449).

211523121255 is a wasteful number, since it uses less digits than its factorization.

211523121255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381122786.

The product of its digits is 6000, while the sum is 30.

Adding to 211523121255 its reverse (552121325112), we get a palindrome (763644446367).

The spelling of 211523121255 in words is "two hundred eleven billion, five hundred twenty-three million, one hundred twenty-one thousand, two hundred fifty-five".