211385638 has 4 divisors (see below), whose sum is σ = 317078460. Its totient is φ = 105692818.

The previous prime is 211385569. The next prime is 211385651. The reversal of 211385638 is 836583112.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 211385597 and 211385606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52846408 + ... + 52846411.

It is an arithmetic number, because the mean of its divisors is an integer number (79269615).

Almost surely, 2^211385638 is an apocalyptic number.

211385638 is a deficient number, since it is larger than the sum of its proper divisors (105692822).

211385638 is a wasteful number, since it uses less digits than its factorization.

211385638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105692821.

The product of its digits is 34560, while the sum is 37.

The square root of 211385638 is about 14539.1071940474. The cubic root of 211385638 is about 595.6966517047.

The spelling of 211385638 in words is "two hundred eleven million, three hundred eighty-five thousand, six hundred thirty-eight".