211774224818 has 18 divisors (see below), whose sum is σ = 343990220157. Its totient is φ = 97738045080.

The previous prime is 211774224737. The next prime is 211774224869. The reversal of 211774224818 is 818422477112.

It can be written as a sum of positive squares in 2 ways, for example, as 181073227729 + 30700997089 = 425527^2 + 175217^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=325403.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8447963 + ... + 8472993.

Almost surely, 2^211774224818 is an apocalyptic number.

211774224818 is a deficient number, since it is larger than the sum of its proper divisors (132215995339).

211774224818 is an frugal number, since it uses more digits than its factorization.

211774224818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50090 (or 25046 counting only the distinct ones).

The product of its digits is 401408, while the sum is 47.

The spelling of 211774224818 in words is "two hundred eleven billion, seven hundred seventy-four million, two hundred twenty-four thousand, eight hundred eighteen".