212231305 has 16 divisors (see below), whose sum is σ = 299202624. Its totient is φ = 142476480.

The previous prime is 212231287. The next prime is 212231317. The reversal of 212231305 is 503132212.

It is not a de Polignac number, because 212231305 - 2²¹ = 210134153 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, 147699 + ... + 149128.

It is an arithmetic number, because the mean of its divisors is an integer number (18700164).

Almost surely, 2^212231305 is an apocalyptic number.

It is an amenable number.

212231305 is a deficient number, since it is larger than the sum of its proper divisors (86971319).

212231305 is a wasteful number, since it uses less digits than its factorization.

212231305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296856.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 212231305 is about 14568.1606594656. The cubic root of 212231305 is about 596.4899738276.

Adding to 212231305 its reverse (503132212), we get a palindrome (715363517).

The spelling of 212231305 in words is "two hundred twelve million, two hundred thirty-one thousand, three hundred five".