212221103021 has 4 divisors (see below), whose sum is σ = 212222084544. Its totient is φ = 212220121500.

The previous prime is 212221103009. The next prime is 212221103051. The reversal of 212221103021 is 120301122212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212221103021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221103051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8405 + ... + 651546.

It is an arithmetic number, because the mean of its divisors is an integer number (53055521136).

Almost surely, 2^212221103021 is an apocalyptic number.

It is an amenable number.

212221103021 is a deficient number, since it is larger than the sum of its proper divisors (981523).

212221103021 is an equidigital number, since it uses as much as digits as its factorization.

212221103021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981522.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 212221103021 its reverse (120301122212), we get a palindrome (332522225233).

The spelling of 212221103021 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred three thousand, twenty-one".