211455041155 has 4 divisors (see below), whose sum is σ = 253746049392. Its totient is φ = 169164032920.

The previous prime is 211455041153. The next prime is 211455041173. The reversal of 211455041155 is 551140554112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 211455041155 - 2¹ = 211455041153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211455041155.

It is not an unprimeable number, because it can be changed into a prime (211455041153) 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, 21145504111 + ... + 21145504120.

It is an arithmetic number, because the mean of its divisors is an integer number (63436512348).

Almost surely, 2^211455041155 is an apocalyptic number.

211455041155 is a deficient number, since it is larger than the sum of its proper divisors (42291008237).

211455041155 is an equidigital number, since it uses as much as digits as its factorization.

211455041155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42291008236.

The product of its (nonzero) digits is 20000, while the sum is 34.

Adding to 211455041155 its reverse (551140554112), we get a palindrome (762595595267).

The spelling of 211455041155 in words is "two hundred eleven billion, four hundred fifty-five million, forty-one thousand, one hundred fifty-five".