210223121 has 4 divisors (see below), whose sum is σ = 217004544. Its totient is φ = 203441700.

The previous prime is 210223109. The next prime is 210223129. The reversal of 210223121 is 121322012.

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 210223121 - 2¹⁰ = 210222097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210223096 and 210223105.

It is not an unprimeable number, because it can be changed into a prime (210223129) 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, 3390665 + ... + 3390726.

It is an arithmetic number, because the mean of its divisors is an integer number (54251136).

Almost surely, 2^210223121 is an apocalyptic number.

It is an amenable number.

210223121 is a deficient number, since it is larger than the sum of its proper divisors (6781423).

210223121 is an equidigital number, since it uses as much as digits as its factorization.

210223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6781422.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 210223121 is about 14499.0731083059. The cubic root of 210223121 is about 594.6026308945.

Adding to 210223121 its reverse (121322012), we get a palindrome (331545133).

The spelling of 210223121 in words is "two hundred ten million, two hundred twenty-three thousand, one hundred twenty-one".