210919138 has 8 divisors (see below), whose sum is σ = 318394332. Its totient is φ = 104787696.

The previous prime is 210919123. The next prime is 210919141. The reversal of 210919138 is 831919012.

210919138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 176544369 + 34374769 = 13287^2 + 5863^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335545 + ... + 336172.

Almost surely, 2^210919138 is an apocalyptic number.

210919138 is a deficient number, since it is larger than the sum of its proper divisors (107475194).

210919138 is a wasteful number, since it uses less digits than its factorization.

210919138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671876.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 210919138 is about 14523.0553947852. The cubic root of 210919138 is about 595.2581211820.

The spelling of 210919138 in words is "two hundred ten million, nine hundred nineteen thousand, one hundred thirty-eight".