213144836 has 6 divisors (see below), whose sum is σ = 373003470. Its totient is φ = 106572416.

The previous prime is 213144821. The next prime is 213144839. The reversal of 213144836 is 638441312.

It can be written as a sum of positive squares in only one way, i.e., 212984836 + 160000 = 14594^2 + 400^2 .

It is a super-2 number, since 2×213144836² = 90861442226933792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213144839) by changing a digit.

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, 26643101 + ... + 26643108.

It is an arithmetic number, because the mean of its divisors is an integer number (62167245).

Almost surely, 2^213144836 is an apocalyptic number.

It is an amenable number.

213144836 is a deficient number, since it is larger than the sum of its proper divisors (159858634).

213144836 is a wasteful number, since it uses less digits than its factorization.

213144836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53286213 (or 53286211 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 213144836 is about 14599.4806756953. The cubic root of 213144836 is about 597.3445950070.

The spelling of 213144836 in words is "two hundred thirteen million, one hundred forty-four thousand, eight hundred thirty-six".