211554320144 has 10 divisors (see below), whose sum is σ = 409886495310. Its totient is φ = 105777160064.

The previous prime is 211554320111. The next prime is 211554320221. The reversal of 211554320144 is 441023455112.

It can be written as a sum of positive squares in only one way, i.e., 194657440000 + 16896880144 = 441200^2 + 129988^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211554320144.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6611072489 + ... + 6611072520.

It is an arithmetic number, because the mean of its divisors is an integer number (40988649531).

Almost surely, 2^211554320144 is an apocalyptic number.

It is an amenable number.

211554320144 is a deficient number, since it is larger than the sum of its proper divisors (198332175166).

211554320144 is a wasteful number, since it uses less digits than its factorization.

211554320144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13222145017 (or 13222145011 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 211554320144 its reverse (441023455112), we get a palindrome (652577775256).

The spelling of 211554320144 in words is "two hundred eleven billion, five hundred fifty-four million, three hundred twenty thousand, one hundred forty-four".