213222009 has 128 divisors (see below), whose sum is σ = 416747520. Its totient is φ = 93312000.

The previous prime is 213221963. The next prime is 213222013. The reversal of 213222009 is 900222312.

213222009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213222009 - 2¹¹ = 213219961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (213222049) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2111059 + ... + 2111159.

It is an arithmetic number, because the mean of its divisors is an integer number (3255840).

Almost surely, 2^213222009 is an apocalyptic number.

It is an amenable number.

213222009 is a deficient number, since it is larger than the sum of its proper divisors (203525511).

213222009 is a wasteful number, since it uses less digits than its factorization.

213222009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 213222009 is about 14602.1234414725. The cubic root of 213222009 is about 597.4166794993.

It can be divided in two parts, 213 and 222009, that added together give a palindrome (222222).

The spelling of 213222009 in words is "two hundred thirteen million, two hundred twenty-two thousand, nine".