212004136 has 8 divisors (see below), whose sum is σ = 397507770. Its totient is φ = 106002064.

The previous prime is 212004101. The next prime is 212004139. The reversal of 212004136 is 631400212.

It can be written as a sum of positive squares in only one way, i.e., 196840900 + 15163236 = 14030^2 + 3894^2 .

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

It is a super-2 number, since 2×212004136² = 89891507362212992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212004139) by changing a digit.

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 as a sum of consecutive naturals, namely, 13250251 + ... + 13250266.

Almost surely, 2^212004136 is an apocalyptic number.

It is an amenable number.

212004136 is a deficient number, since it is larger than the sum of its proper divisors (185503634).

212004136 is a wasteful number, since it uses less digits than its factorization.

212004136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26500523 (or 26500519 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 212004136 is about 14560.3618086914. The cubic root of 212004136 is about 596.2770734000.

Adding to 212004136 its reverse (631400212), we get a palindrome (843404348).

The spelling of 212004136 in words is "two hundred twelve million, four thousand, one hundred thirty-six".