211233157505 has 8 divisors (see below), whose sum is σ = 255330007272. Its totient is φ = 167753047168.

The previous prime is 211233157463. The next prime is 211233157519. The reversal of 211233157505 is 505751332112.

It can be written as a sum of positive squares in 4 ways, for example, as 7398064144 + 203835093361 = 86012^2 + 451481^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 211233157505 - 2¹² = 211233153409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154184102 + ... + 154185471.

It is an arithmetic number, because the mean of its divisors is an integer number (31916250909).

Almost surely, 2^211233157505 is an apocalyptic number.

It is an amenable number.

211233157505 is a deficient number, since it is larger than the sum of its proper divisors (44096849767).

211233157505 is a wasteful number, since it uses less digits than its factorization.

211233157505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308369715.

The product of its (nonzero) digits is 31500, while the sum is 35.

Adding to 211233157505 its reverse (505751332112), we get a palindrome (716984489617).

The spelling of 211233157505 in words is "two hundred eleven billion, two hundred thirty-three million, one hundred fifty-seven thousand, five hundred five".