211545412 has 18 divisors (see below), whose sum is σ = 400873578. Its totient is φ = 97636032.

The previous prime is 211545403. The next prime is 211545431. The reversal of 211545412 is 214545112.

It can be written as a sum of positive squares in 3 ways, for example, as 1179396 + 210366016 = 1086^2 + 14504^2 .

It is a super-2 number, since 2×211545412² = 89502922676499488, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 155793 + ... + 157144.

Almost surely, 2^211545412 is an apocalyptic number.

It is an amenable number.

211545412 is a deficient number, since it is larger than the sum of its proper divisors (189328166).

211545412 is a wasteful number, since it uses less digits than its factorization.

211545412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312967 (or 312952 counting only the distinct ones).

The product of its digits is 1600, while the sum is 25.

The square root of 211545412 is about 14544.6007851711. The cubic root of 211545412 is about 595.8466979555.

The spelling of 211545412 in words is "two hundred eleven million, five hundred forty-five thousand, four hundred twelve".