211561523364 has 48 divisors (see below), whose sum is σ = 522890012736. Its totient is φ = 66345753600.

The previous prime is 211561523357. The next prime is 211561523387. The reversal of 211561523364 is 463325165112.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308599 + ... + 719969.

It is an arithmetic number, because the mean of its divisors is an integer number (10893541932).

Almost surely, 2^211561523364 is an apocalyptic number.

It is an amenable number.

211561523364 is an abundant number, since it is smaller than the sum of its proper divisors (311328489372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211561523364 is a wasteful number, since it uses less digits than its factorization.

211561523364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413916 (or 413914 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

Adding to 211561523364 its reverse (463325165112), we get a palindrome (674886688476).

The spelling of 211561523364 in words is "two hundred eleven billion, five hundred sixty-one million, five hundred twenty-three thousand, three hundred sixty-four".