213046644 has 48 divisors (see below), whose sum is σ = 523998720. Its totient is φ = 67267200.

The previous prime is 213046637. The next prime is 213046649. The reversal of 213046644 is 446640312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213046649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12669 + ... + 24219.

It is an arithmetic number, because the mean of its divisors is an integer number (10916640).

Almost surely, 2^213046644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213046644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261999360).

213046644 is an abundant number, since it is smaller than the sum of its proper divisors (310952076).

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

213046644 is a wasteful number, since it uses less digits than its factorization.

213046644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11640 (or 11638 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 213046644 is about 14596.1174289603. The cubic root of 213046644 is about 597.2528522732.

Adding to 213046644 its reverse (446640312), we get a palindrome (659686956).

The spelling of 213046644 in words is "two hundred thirteen million, forty-six thousand, six hundred forty-four".