211438105928 has 16 divisors (see below), whose sum is σ = 453081655680. Its totient is φ = 90616331088.

The previous prime is 211438105927. The next prime is 211438105939. The reversal of 211438105928 is 829501834112.

It is not an unprimeable number, because it can be changed into a prime (211438105927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887840176 + ... + 1887840287.

It is an arithmetic number, because the mean of its divisors is an integer number (28317603480).

Almost surely, 2^211438105928 is an apocalyptic number.

211438105928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

211438105928 is an abundant number, since it is smaller than the sum of its proper divisors (241643549752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211438105928 is a wasteful number, since it uses less digits than its factorization.

211438105928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3775680476 (or 3775680472 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 211438105928 in words is "two hundred eleven billion, four hundred thirty-eight million, one hundred five thousand, nine hundred twenty-eight".