211221982 has 8 divisors (see below), whose sum is σ = 317004336. Its totient is φ = 105553872.

The previous prime is 211221979. The next prime is 211222019. The reversal of 211221982 is 289122112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×211221982² = 89229451360016648, 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 211221982.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23778 + ... + 31429.

It is an arithmetic number, because the mean of its divisors is an integer number (39625542).

Almost surely, 2^211221982 is an apocalyptic number.

211221982 is a deficient number, since it is larger than the sum of its proper divisors (105782354).

211221982 is a wasteful number, since it uses less digits than its factorization.

211221982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57122.

The product of its digits is 1152, while the sum is 28.

The square root of 211221982 is about 14533.4779732864. The cubic root of 211221982 is about 595.5428814014.

It can be divided in two parts, 21122 and 1982, that added together give a square (23104 = 152²).

The spelling of 211221982 in words is "two hundred eleven million, two hundred twenty-one thousand, nine hundred eighty-two".