212905172 has 12 divisors (see below), whose sum is σ = 376273716. Its totient is φ = 105398400.

The previous prime is 212905171. The next prime is 212905183. The reversal of 212905172 is 271509212.

It can be written as a sum of positive squares in 2 ways, for example, as 111218116 + 101687056 = 10546^2 + 10084^2 .

It is a super-2 number, since 2×212905172² = 90657224528699168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212905171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263093 + ... + 263900.

It is an arithmetic number, because the mean of its divisors is an integer number (31356143).

Almost surely, 2^212905172 is an apocalyptic number.

It is an amenable number.

212905172 is a deficient number, since it is larger than the sum of its proper divisors (163368544).

212905172 is a wasteful number, since it uses less digits than its factorization.

212905172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527098 (or 527096 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 212905172 is about 14591.2704039093. The cubic root of 212905172 is about 597.1206225989.

It can be divided in two parts, 21290 and 5172, that added together give a palindrome (26462).

The spelling of 212905172 in words is "two hundred twelve million, nine hundred five thousand, one hundred seventy-two".