212305611 has 16 divisors (see below), whose sum is σ = 324105984. Its totient is φ = 121095264.

The previous prime is 212305531. The next prime is 212305631. The reversal of 212305611 is 116503212.

It is not a de Polignac number, because 212305611 - 2¹⁴ = 212289227 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (212305631) 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, 2845 + ... + 20801.

It is an arithmetic number, because the mean of its divisors is an integer number (20256624).

Almost surely, 2^212305611 is an apocalyptic number.

212305611 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212305611 is a deficient number, since it is larger than the sum of its proper divisors (111800373).

212305611 is a wasteful number, since it uses less digits than its factorization.

212305611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18530.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 212305611 is about 14570.7107239146. The cubic root of 212305611 is about 596.5595796637.

Adding to 212305611 its reverse (116503212), we get a palindrome (328808823).

The spelling of 212305611 in words is "two hundred twelve million, three hundred five thousand, six hundred eleven".