210639187434 has 16 divisors (see below), whose sum is σ = 453684403872. Its totient is φ = 64812057648.

The previous prime is 210639187411. The next prime is 210639187439. The reversal of 210639187434 is 434781936012.

210639187434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (210639187439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1350251124 + ... + 1350251279.

It is an arithmetic number, because the mean of its divisors is an integer number (28355275242).

Almost surely, 2^210639187434 is an apocalyptic number.

210639187434 is an abundant number, since it is smaller than the sum of its proper divisors (243045216438).

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

210639187434 is a wasteful number, since it uses less digits than its factorization.

210639187434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700502421.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 210639187434 in words is "two hundred ten billion, six hundred thirty-nine million, one hundred eighty-seven thousand, four hundred thirty-four".