221023212 has 24 divisors (see below), whose sum is σ = 516235776. Its totient is φ = 73600848.

The previous prime is 221023183. The next prime is 221023217. The reversal of 221023212 is 212320122.

It is a happy number.

221023212 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221023191 and 221023200.

It is not an unprimeable number, because it can be changed into a prime (221023217) 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, 4093 + ... + 21419.

It is an arithmetic number, because the mean of its divisors is an integer number (21509824).

Almost surely, 2^221023212 is an apocalyptic number.

It is an amenable number.

221023212 is an abundant number, since it is smaller than the sum of its proper divisors (295212564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221023212 is a wasteful number, since it uses less digits than its factorization.

221023212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18397 (or 18395 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221023212 is about 14866.8494308646. The cubic root of 221023212 is about 604.6155260462.

Adding to 221023212 its reverse (212320122), we get a palindrome (433343334).

The spelling of 221023212 in words is "two hundred twenty-one million, twenty-three thousand, two hundred twelve".