22211212021 has 4 divisors (see below), whose sum is σ = 23380223200. Its totient is φ = 21042200844.

The previous prime is 22211212003. The next prime is 22211212031. The reversal of 22211212021 is 12021211222.

It is a happy number.

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 22211212021 - 2⁹ = 22211211509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22211211986 and 22211212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211212031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584505561 + ... + 584505598.

It is an arithmetic number, because the mean of its divisors is an integer number (5845055800).

Almost surely, 2^22211212021 is an apocalyptic number.

It is an amenable number.

22211212021 is a deficient number, since it is larger than the sum of its proper divisors (1169011179).

22211212021 is a wasteful number, since it uses less digits than its factorization.

22211212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169011178.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22211212021 its reverse (12021211222), we get a palindrome (34232423243).

The spelling of 22211212021 in words is "twenty-two billion, two hundred eleven million, two hundred twelve thousand, twenty-one".