211505450215 has 8 divisors (see below), whose sum is σ = 253812354048. Its totient is φ = 169200484320.

The previous prime is 211505450183. The next prime is 211505450249. The reversal of 211505450215 is 512054505112.

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

It is not a de Polignac number, because 211505450215 - 2⁵ = 211505450183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232456 + ... + 690685.

It is an arithmetic number, because the mean of its divisors is an integer number (31726544256).

Almost surely, 2^211505450215 is an apocalyptic number.

211505450215 is a deficient number, since it is larger than the sum of its proper divisors (42306903833).

211505450215 is an equidigital number, since it uses as much as digits as its factorization.

211505450215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968969.

The product of its (nonzero) digits is 10000, while the sum is 31.

Adding to 211505450215 its reverse (512054505112), we get a palindrome (723559955327).

The spelling of 211505450215 in words is "two hundred eleven billion, five hundred five million, four hundred fifty thousand, two hundred fifteen".