21210166674 has 48 divisors (see below), whose sum is σ = 47066752512. Its totient is φ = 6899929344.

The previous prime is 21210166673. The next prime is 21210166693. The reversal of 21210166674 is 47666101212.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21210166673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 263127 + ... + 334149.

It is an arithmetic number, because the mean of its divisors is an integer number (980557344).

Almost surely, 2^21210166674 is an apocalyptic number.

21210166674 is an abundant number, since it is smaller than the sum of its proper divisors (25856585838).

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

21210166674 is a wasteful number, since it uses less digits than its factorization.

21210166674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71431 (or 71428 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

Adding to 21210166674 its reverse (47666101212), we get a palindrome (68876267886).

The spelling of 21210166674 in words is "twenty-one billion, two hundred ten million, one hundred sixty-six thousand, six hundred seventy-four".