16212405 has 16 divisors (see below), whose sum is σ = 28298304. Its totient is φ = 7860480.

The previous prime is 16212389. The next prime is 16212409. The reversal of 16212405 is 50421261.

It is not a de Polignac number, because 16212405 - 2⁴ = 16212389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16212409) 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, 48964 + ... + 49293.

It is an arithmetic number, because the mean of its divisors is an integer number (1768644).

Almost surely, 2^16212405 is an apocalyptic number.

16212405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16212405 is a deficient number, since it is larger than the sum of its proper divisors (12085899).

16212405 is a wasteful number, since it uses less digits than its factorization.

16212405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98276.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 16212405 is about 4026.4630881209. The cubic root of 16212405 is about 253.0943681878.

Adding to 16212405 its reverse (50421261), we get a palindrome (66633666).

Subtracting 16212405 from its reverse (50421261), we obtain a triangular number (34208856 = T₈₂₇₁).

The spelling of 16212405 in words is "sixteen million, two hundred twelve thousand, four hundred five".