206211172 has 12 divisors (see below), whose sum is σ = 365438080. Its totient is φ = 101800296.

The previous prime is 206211157. The next prime is 206211191. The reversal of 206211172 is 271112602.

It is a happy number.

It is a super-2 number, since 2×206211172² = 85046094915227168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325968 + ... + 326599.

Almost surely, 2^206211172 is an apocalyptic number.

It is an amenable number.

206211172 is a deficient number, since it is larger than the sum of its proper divisors (159226908).

206211172 is a wasteful number, since it uses less digits than its factorization.

206211172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652650 (or 652648 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 206211172 is about 14360.0547352717. The cubic root of 206211172 is about 590.7957967713.

Adding to 206211172 its reverse (271112602), we get a palindrome (477323774).

The spelling of 206211172 in words is "two hundred six million, two hundred eleven thousand, one hundred seventy-two".