212641605 has 80 divisors (see below), whose sum is σ = 423403200. Its totient is φ = 101226240.

The previous prime is 212641591. The next prime is 212641609. The reversal of 212641605 is 506146212.

212641605 is a `hidden beast` number, since 2 + 12 + 6 + 41 + 605 = 666.

212641605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212641605 - 2⁴ = 212641589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212641609) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 262441 + ... + 263249.

It is an arithmetic number, because the mean of its divisors is an integer number (5292540).

Almost surely, 2^212641605 is an apocalyptic number.

It is an amenable number.

212641605 is a deficient number, since it is larger than the sum of its proper divisors (210761595).

212641605 is a wasteful number, since it uses less digits than its factorization.

212641605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896 (or 887 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 212641605 is about 14582.2359396630. The cubic root of 212641605 is about 596.8741180510.

Adding to 212641605 its reverse (506146212), we get a palindrome (718787817).

The spelling of 212641605 in words is "two hundred twelve million, six hundred forty-one thousand, six hundred five".