212101405 has 16 divisors (see below), whose sum is σ = 261273600. Its totient is φ = 165197440.

The previous prime is 212101399. The next prime is 212101441. The reversal of 212101405 is 504101212.

It is not a de Polignac number, because 212101405 - 2⁷ = 212101277 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 146676 + ... + 148114.

It is an arithmetic number, because the mean of its divisors is an integer number (16329600).

Almost surely, 2^212101405 is an apocalyptic number.

It is an amenable number.

212101405 is a deficient number, since it is larger than the sum of its proper divisors (49172195).

212101405 is a wasteful number, since it uses less digits than its factorization.

212101405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 212101405 is about 14563.7016242437. The cubic root of 212101405 is about 596.3682515060.

Adding to 212101405 its reverse (504101212), we get a palindrome (716202617).

The spelling of 212101405 in words is "two hundred twelve million, one hundred one thousand, four hundred five".