213221123 has 8 divisors (see below), whose sum is σ = 226064592. Its totient is φ = 200411136.

The previous prime is 213221117. The next prime is 213221143. The reversal of 213221123 is 321122312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213221123 - 2¹⁰ = 213220099 is a prime.

It is a super-2 number, since 2×213221123² = 90926494586762258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213221143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5411 + ... + 21347.

It is an arithmetic number, because the mean of its divisors is an integer number (28258074).

Almost surely, 2^213221123 is an apocalyptic number.

213221123 is a deficient number, since it is larger than the sum of its proper divisors (12843469).

213221123 is a wasteful number, since it uses less digits than its factorization.

213221123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16741.

The product of its digits is 144, while the sum is 17.

The square root of 213221123 is about 14602.0931033876. The cubic root of 213221123 is about 597.4158520176.

Adding to 213221123 its reverse (321122312), we get a palindrome (534343435).

The spelling of 213221123 in words is "two hundred thirteen million, two hundred twenty-one thousand, one hundred twenty-three".