210842138 has 16 divisors (see below), whose sum is σ = 340835040. Its totient is φ = 97242096.

The previous prime is 210842117. The next prime is 210842153. The reversal of 210842138 is 831248012.

It is a super-2 number, since 2×210842138² = 88908814312822088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 210842138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59081 + ... + 62547.

It is an arithmetic number, because the mean of its divisors is an integer number (21302190).

Almost surely, 2^210842138 is an apocalyptic number.

210842138 is a deficient number, since it is larger than the sum of its proper divisors (129992902).

210842138 is a wasteful number, since it uses less digits than its factorization.

210842138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5821.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 210842138 is about 14520.4041954761. The cubic root of 210842138 is about 595.1856756396.

The spelling of 210842138 in words is "two hundred ten million, eight hundred forty-two thousand, one hundred thirty-eight".