212211210021 has 8 divisors (see below), whose sum is σ = 286824284160. Its totient is φ = 139536137952.

The previous prime is 212211209957. The next prime is 212211210037. The reversal of 212211210021 is 120012112212.

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

It is not a de Polignac number, because 212211210021 - 2⁶ = 212211209957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212211210221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484500261 + ... + 484500698.

It is an arithmetic number, because the mean of its divisors is an integer number (35853035520).

Almost surely, 2^212211210021 is an apocalyptic number.

It is an amenable number.

212211210021 is a deficient number, since it is larger than the sum of its proper divisors (74613074139).

212211210021 is an equidigital number, since it uses as much as digits as its factorization.

212211210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969001035.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212211210021 its reverse (120012112212), we get a palindrome (332223322233).

The spelling of 212211210021 in words is "two hundred twelve billion, two hundred eleven million, two hundred ten thousand, twenty-one".