212109736 has 8 divisors (see below), whose sum is σ = 397705770. Its totient is φ = 106054864.

The previous prime is 212109721. The next prime is 212109757. The reversal of 212109736 is 637901212.

It can be written as a sum of positive squares in only one way, i.e., 198640836 + 13468900 = 14094^2 + 3670^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 212109698 and 212109707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13256851 + ... + 13256866.

Almost surely, 2^212109736 is an apocalyptic number.

It is an amenable number.

212109736 is a deficient number, since it is larger than the sum of its proper divisors (185596034).

212109736 is a wasteful number, since it uses less digits than its factorization.

212109736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26513723 (or 26513719 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 212109736 is about 14563.9876407528. The cubic root of 212109736 is about 596.3760595304.

The spelling of 212109736 in words is "two hundred twelve million, one hundred nine thousand, seven hundred thirty-six".