212222304 has 72 divisors (see below), whose sum is σ = 689729040. Its totient is φ = 60634368.

The previous prime is 212222303. The next prime is 212222321. The reversal of 212222304 is 403222212.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212222303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50619 + ... + 54650.

It is an arithmetic number, because the mean of its divisors is an integer number (9579570).

Almost surely, 2^212222304 is an apocalyptic number.

212222304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

212222304 is an abundant number, since it is smaller than the sum of its proper divisors (477506736).

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

212222304 is a wasteful number, since it uses less digits than its factorization.

212222304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105292 (or 105281 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 212222304 is about 14567.8517290642. The cubic root of 212222304 is about 596.4815410752.

Adding to 212222304 its reverse (403222212), we get a palindrome (615444516).

The spelling of 212222304 in words is "two hundred twelve million, two hundred twenty-two thousand, three hundred four".