213044220 has 36 divisors (see below), whose sum is σ = 646234680. Its totient is φ = 56811744.

The previous prime is 213044219. The next prime is 213044257. The reversal of 213044220 is 22440312.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 213044193 and 213044202.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 591610 + ... + 591969.

Almost surely, 2^213044220 is an apocalyptic number.

213044220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213044220 is an abundant number, since it is smaller than the sum of its proper divisors (433190460).

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

213044220 is a wasteful number, since it uses less digits than its factorization.

213044220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183594 (or 1183589 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 213044220 is about 14596.0343929439. The cubic root of 213044220 is about 597.2505871254.

Adding to 213044220 its reverse (22440312), we get a palindrome (235484532).

The spelling of 213044220 in words is "two hundred thirteen million, forty-four thousand, two hundred twenty".