210533138 has 4 divisors (see below), whose sum is σ = 315799710. Its totient is φ = 105266568.

The previous prime is 210533137. The next prime is 210533161. The reversal of 210533138 is 831335012.

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

It can be written as a sum of positive squares in only one way, i.e., 210453049 + 80089 = 14507^2 + 283^2 .

It is a super-2 number, since 2×210533138² = 88648404392254088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (210533131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52633283 + ... + 52633286.

Almost surely, 2^210533138 is an apocalyptic number.

210533138 is a deficient number, since it is larger than the sum of its proper divisors (105266572).

210533138 is a wasteful number, since it uses less digits than its factorization.

210533138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105266571.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 210533138 is about 14509.7600945019. The cubic root of 210533138 is about 594.8947750744.

The spelling of 210533138 in words is "two hundred ten million, five hundred thirty-three thousand, one hundred thirty-eight".