213885221 has 4 divisors (see below), whose sum is σ = 233329344. Its totient is φ = 194441100.

The previous prime is 213885193. The next prime is 213885227. The reversal of 213885221 is 122588312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213885221 - 2²² = 209690917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213885227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9722045 + ... + 9722066.

It is an arithmetic number, because the mean of its divisors is an integer number (58332336).

Almost surely, 2^213885221 is an apocalyptic number.

It is an amenable number.

213885221 is a deficient number, since it is larger than the sum of its proper divisors (19444123).

213885221 is a wasteful number, since it uses less digits than its factorization.

213885221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19444122.

The product of its digits is 7680, while the sum is 32.

The square root of 213885221 is about 14624.8152466963. The cubic root of 213885221 is about 598.0354458619.

The spelling of 213885221 in words is "two hundred thirteen million, eight hundred eighty-five thousand, two hundred twenty-one".