7812222212221 has 8 divisors (see below), whose sum is σ = 8933441799744. Its totient is φ = 6692299585440.

The previous prime is 7812222212203. The next prime is 7812222212237. The reversal of 7812222212221 is 1222122222187.

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

It is not a de Polignac number, because 7812222212221 - 2¹¹ = 7812222210173 is a prime.

It is a super-2 number, since 2×7812222212221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7812222212251) 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, 324227275 + ... + 324251368.

It is an arithmetic number, because the mean of its divisors is an integer number (1116680224968).

Almost surely, 2^{7812222212221} is an apocalyptic number.

It is an amenable number.

7812222212221 is a deficient number, since it is larger than the sum of its proper divisors (1121219587523).

7812222212221 is a wasteful number, since it uses less digits than its factorization.

7812222212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648480371.

The product of its digits is 14336, while the sum is 34.

The spelling of 7812222212221 in words is "seven trillion, eight hundred twelve billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".