212222521 has 8 divisors (see below), whose sum is σ = 243203840. Its totient is φ = 181407168.

The previous prime is 212222503. The next prime is 212222557. The reversal of 212222521 is 125222212.

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

It is a cyclic number.

It is not a de Polignac number, because 212222521 - 2⁹ = 212222009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212222321) 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, 38736 + ... + 43873.

It is an arithmetic number, because the mean of its divisors is an integer number (30400480).

Almost surely, 2^212222521 is an apocalyptic number.

It is an amenable number.

212222521 is a deficient number, since it is larger than the sum of its proper divisors (30981319).

212222521 is an equidigital number, since it uses as much as digits as its factorization.

212222521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82983.

The product of its digits is 320, while the sum is 19.

The square root of 212222521 is about 14567.8591769690. The cubic root of 212222521 is about 596.4817443784.

Adding to 212222521 its reverse (125222212), we get a palindrome (337444733).

The spelling of 212222521 in words is "two hundred twelve million, two hundred twenty-two thousand, five hundred twenty-one".