212720436 has 18 divisors (see below), whose sum is σ = 537710082. Its totient is φ = 70906800.

The previous prime is 212720393. The next prime is 212720471. The reversal of 212720436 is 634027212.

It can be written as a sum of positive squares in only one way, i.e., 137030436 + 75690000 = 11706^2 + 8700^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2954415 + ... + 2954486.

Almost surely, 2^212720436 is an apocalyptic number.

It is an amenable number.

212720436 is an abundant number, since it is smaller than the sum of its proper divisors (324989646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212720436 is a wasteful number, since it uses less digits than its factorization.

212720436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5908911 (or 5908906 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 212720436 is about 14584.9386697374. The cubic root of 212720436 is about 596.9478671344.

Adding to 212720436 its reverse (634027212), we get a palindrome (846747648).

The spelling of 212720436 in words is "two hundred twelve million, seven hundred twenty thousand, four hundred thirty-six".