9921222 has 12 divisors (see below), whose sum is σ = 21496020. Its totient is φ = 3307068.

The previous prime is 9921199. The next prime is 9921227. The reversal of 9921222 is 2221299.

9921222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 275572 + ... + 275607.

It is an arithmetic number, because the mean of its divisors is an integer number (1791335).

Almost surely, 2^9921222 is an apocalyptic number.

9921222 is an abundant number, since it is smaller than the sum of its proper divisors (11574798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9921222 is a wasteful number, since it uses less digits than its factorization.

9921222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551187 (or 551184 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 9921222 is about 3149.7971363248. The cubic root of 9921222 is about 214.8762366843.

It can be divided in two parts, 99 and 21222, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 9921222 in words is "nine million, nine hundred twenty-one thousand, two hundred twenty-two".