211155005551 has 8 divisors (see below), whose sum is σ = 241368320000. Its totient is φ = 180953769528.

The previous prime is 211155005531. The next prime is 211155005561. The reversal of 211155005551 is 155500551112.

It is a happy number.

211155005551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211155005551 - 2¹⁵ = 211154972783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211155005531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2982111 + ... + 3052096.

It is an arithmetic number, because the mean of its divisors is an integer number (30171040000).

Almost surely, 2^211155005551 is an apocalyptic number.

211155005551 is a deficient number, since it is larger than the sum of its proper divisors (30213314449).

211155005551 is an equidigital number, since it uses as much as digits as its factorization.

211155005551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6039213.

The product of its (nonzero) digits is 6250, while the sum is 31.

Adding to 211155005551 its reverse (155500551112), we get a palindrome (366655556663).

The spelling of 211155005551 in words is "two hundred eleven billion, one hundred fifty-five million, five thousand, five hundred fifty-one".