213221304 has 48 divisors (see below), whose sum is σ = 579613320. Its totient is φ = 70810560.

The previous prime is 213221251. The next prime is 213221377. The reversal of 213221304 is 403122312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14599 + ... + 25289.

Almost surely, 2^213221304 is an apocalyptic number.

213221304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

213221304 is an abundant number, since it is smaller than the sum of its proper divisors (366392016).

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

213221304 is a wasteful number, since it uses less digits than its factorization.

213221304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10980 (or 10973 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 213221304 is about 14602.0993011279. The cubic root of 213221304 is about 597.4160210632.

Adding to 213221304 its reverse (403122312), we get a palindrome (616343616).

It can be divided in two parts, 2132 and 21304, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 213221304 in words is "two hundred thirteen million, two hundred twenty-one thousand, three hundred four".