212211223421 has 4 divisors (see below), whose sum is σ = 223380235200. Its totient is φ = 201042211644.

The previous prime is 212211223417. The next prime is 212211223489. The reversal of 212211223421 is 124322112212.

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.

It is a cyclic number.

It is not a de Polignac number, because 212211223421 - 2² = 212211223417 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 (212211223121) 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, 5584505861 + ... + 5584505898.

It is an arithmetic number, because the mean of its divisors is an integer number (55845058800).

Almost surely, 2^212211223421 is an apocalyptic number.

It is an amenable number.

212211223421 is a deficient number, since it is larger than the sum of its proper divisors (11169011779).

212211223421 is a wasteful number, since it uses less digits than its factorization.

212211223421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11169011778.

The product of its digits is 768, while the sum is 23.

Adding to 212211223421 its reverse (124322112212), we get a palindrome (336533335633).

The spelling of 212211223421 in words is "two hundred twelve billion, two hundred eleven million, two hundred twenty-three thousand, four hundred twenty-one".