210021012223 has 4 divisors (see below), whose sum is σ = 229113831528. Its totient is φ = 190928192920.

The previous prime is 210021012221. The next prime is 210021012239. The reversal of 210021012223 is 322210120012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 210021012223 - 2¹ = 210021012221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021012197 and 210021012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021012221) 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, 9546409636 + ... + 9546409657.

It is an arithmetic number, because the mean of its divisors is an integer number (57278457882).

Almost surely, 2^210021012223 is an apocalyptic number.

210021012223 is a deficient number, since it is larger than the sum of its proper divisors (19092819305).

210021012223 is a wasteful number, since it uses less digits than its factorization.

210021012223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19092819304.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 210021012223 its reverse (322210120012), we get a palindrome (532231132235).

The spelling of 210021012223 in words is "two hundred ten billion, twenty-one million, twelve thousand, two hundred twenty-three".