211123145 has 16 divisors (see below), whose sum is σ = 261070992. Its totient is φ = 163799040.

The previous prime is 211123139. The next prime is 211123169. The reversal of 211123145 is 541321112.

It can be written as a sum of positive squares in 8 ways, for example, as 41576704 + 169546441 = 6448^2 + 13021^2 .

It is a de Polignac number, because none of the positive numbers 2^k-211123145 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32489 + ... + 38441.

It is an arithmetic number, because the mean of its divisors is an integer number (16316937).

Almost surely, 2^211123145 is an apocalyptic number.

It is an amenable number.

211123145 is a deficient number, since it is larger than the sum of its proper divisors (49947847).

211123145 is a wasteful number, since it uses less digits than its factorization.

211123145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6172.

The product of its digits is 240, while the sum is 20.

The square root of 211123145 is about 14530.0772537520. The cubic root of 211123145 is about 595.4499762113.

Adding to 211123145 its reverse (541321112), we get a palindrome (752444257).

The spelling of 211123145 in words is "two hundred eleven million, one hundred twenty-three thousand, one hundred forty-five".