212638105 has 16 divisors (see below), whose sum is σ = 271931904. Its totient is φ = 159248320.

The previous prime is 212638099. The next prime is 212638109. The reversal of 212638105 is 501836212.

212638105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-212638105 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212638109) 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, 14266 + ... + 25075.

It is an arithmetic number, because the mean of its divisors is an integer number (16995744).

Almost surely, 2^212638105 is an apocalyptic number.

It is an amenable number.

212638105 is a deficient number, since it is larger than the sum of its proper divisors (59293799).

212638105 is a wasteful number, since it uses less digits than its factorization.

212638105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39416.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 212638105 is about 14582.1159301385. The cubic root of 212638105 is about 596.8708432593.

The spelling of 212638105 in words is "two hundred twelve million, six hundred thirty-eight thousand, one hundred five".