223212021 has 8 divisors (see below), whose sum is σ = 300505920. Its totient is φ = 147363072.

The previous prime is 223212007. The next prime is 223212029. The reversal of 223212021 is 120212322.

It is a happy number.

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

It is not a de Polignac number, because 223212021 - 2²² = 219017717 is a prime.

It is a super-3 number, since 3×223212021³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223212029) 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, 360876 + ... + 361493.

It is an arithmetic number, because the mean of its divisors is an integer number (37563240).

Almost surely, 2^223212021 is an apocalyptic number.

It is an amenable number.

223212021 is a deficient number, since it is larger than the sum of its proper divisors (77293899).

223212021 is a wasteful number, since it uses less digits than its factorization.

223212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722475.

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

The square root of 223212021 is about 14940.2818246511. The cubic root of 223212021 is about 606.6048242654.

Adding to 223212021 its reverse (120212322), we get a palindrome (343424343).

It can be divided in two parts, 22321 and 2021, that added together give a palindrome (24342).

The spelling of 223212021 in words is "two hundred twenty-three million, two hundred twelve thousand, twenty-one".