211215772 has 24 divisors (see below), whose sum is σ = 383201280. Its totient is φ = 101759280.

The previous prime is 211215749. The next prime is 211215773. The reversal of 211215772 is 277512112.

It is a super-2 number, since 2×211215772² = 89224204683111968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211215772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211215773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26073 + ... + 33199.

It is an arithmetic number, because the mean of its divisors is an integer number (15966720).

Almost surely, 2^211215772 is an apocalyptic number.

It is an amenable number.

211215772 is a deficient number, since it is larger than the sum of its proper divisors (171985508).

211215772 is a wasteful number, since it uses less digits than its factorization.

211215772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7401 (or 7399 counting only the distinct ones).

The product of its digits is 1960, while the sum is 28.

The square root of 211215772 is about 14533.2643270533. The cubic root of 211215772 is about 595.5370449547.

Adding to 211215772 its reverse (277512112), we get a palindrome (488727884).

The spelling of 211215772 in words is "two hundred eleven million, two hundred fifteen thousand, seven hundred seventy-two".