212011280 has 40 divisors (see below), whose sum is σ = 530846232. Its totient is φ = 78280704.

The previous prime is 212011277. The next prime is 212011297. The reversal of 212011280 is 82110212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5456896 + 206554384 = 2336^2 + 14372^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100889 + ... + 102968.

Almost surely, 2^212011280 is an apocalyptic number.

212011280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212011280 is an abundant number, since it is smaller than the sum of its proper divisors (318834952).

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

212011280 is a wasteful number, since it uses less digits than its factorization.

212011280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203883 (or 203877 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 212011280 is about 14560.6071301989. The cubic root of 212011280 is about 596.2837709982.

Adding to 212011280 its reverse (82110212), we get a palindrome (294121492).

The spelling of 212011280 in words is "two hundred twelve million, eleven thousand, two hundred eighty".