211442636 has 6 divisors (see below), whose sum is σ = 370024620. Its totient is φ = 105721316.

The previous prime is 211442629. The next prime is 211442639. The reversal of 211442636 is 636244112.

It is a junction number, because it is equal to n+sod(n) for n = 211442599 and 211442608.

It is not an unprimeable number, because it can be changed into a prime (211442639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26430326 + ... + 26430333.

It is an arithmetic number, because the mean of its divisors is an integer number (61670770).

Almost surely, 2^211442636 is an apocalyptic number.

It is an amenable number.

211442636 is a deficient number, since it is larger than the sum of its proper divisors (158581984).

211442636 is a wasteful number, since it uses less digits than its factorization.

211442636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52860663 (or 52860661 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 211442636 is about 14541.0672235569. The cubic root of 211442636 is about 595.7501880862.

Adding to 211442636 its reverse (636244112), we get a palindrome (847686748).

The spelling of 211442636 in words is "two hundred eleven million, four hundred forty-two thousand, six hundred thirty-six".