660212211 has 16 divisors (see below), whose sum is σ = 895656960. Its totient is φ = 432469920.

The previous prime is 660212197. The next prime is 660212213. The reversal of 660212211 is 112212066.

It is not a de Polignac number, because 660212211 - 2⁷ = 660212083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660212213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332620 + ... + 334598.

It is an arithmetic number, because the mean of its divisors is an integer number (55978560).

Almost surely, 2^660212211 is an apocalyptic number.

660212211 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

660212211 is a deficient number, since it is larger than the sum of its proper divisors (235444749).

660212211 is a wasteful number, since it uses less digits than its factorization.

660212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3866.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 660212211 is about 25694.5949763759. The cubic root of 660212211 is about 870.7520739503.

Adding to 660212211 its reverse (112212066), we get a palindrome (772424277).

The spelling of 660212211 in words is "six hundred sixty million, two hundred twelve thousand, two hundred eleven".