211219720 has 16 divisors (see below), whose sum is σ = 475244460. Its totient is φ = 84487872.

The previous prime is 211219703. The next prime is 211219721. The reversal of 211219720 is 27912112.

It can be written as a sum of positive squares in 2 ways, for example, as 197514916 + 13704804 = 14054^2 + 3702^2 .

It is a super-2 number, since 2×211219720² = 89227540233756800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211219721) 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 in 3 ways as a sum of consecutive naturals, for example, 2640207 + ... + 2640286.

Almost surely, 2^211219720 is an apocalyptic number.

211219720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211219720 is an abundant number, since it is smaller than the sum of its proper divisors (264024740).

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

211219720 is a wasteful number, since it uses less digits than its factorization.

211219720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5280504 (or 5280500 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 211219720 is about 14533.4001527516. The cubic root of 211219720 is about 595.5407554819.

The spelling of 211219720 in words is "two hundred eleven million, two hundred nineteen thousand, seven hundred twenty".