211985642 has 8 divisors (see below), whose sum is σ = 346885632. Its totient is φ = 96357100.

The previous prime is 211985633. The next prime is 211985647. The reversal of 211985642 is 246589112.

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

It is a junction number, because it is equal to n+sod(n) for n = 211985596 and 211985605.

It is not an unprimeable number, because it can be changed into a prime (211985647) 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, 4817834 + ... + 4817877.

It is an arithmetic number, because the mean of its divisors is an integer number (43360704).

Almost surely, 2^211985642 is an apocalyptic number.

211985642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

211985642 is a deficient number, since it is larger than the sum of its proper divisors (134899990).

211985642 is a wasteful number, since it uses less digits than its factorization.

211985642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9635724.

The product of its digits is 34560, while the sum is 38.

The square root of 211985642 is about 14559.7267144682. The cubic root of 211985642 is about 596.2597343218.

The spelling of 211985642 in words is "two hundred eleven million, nine hundred eighty-five thousand, six hundred forty-two".