21222932 has 6 divisors (see below), whose sum is σ = 37140138. Its totient is φ = 10611464.

The previous prime is 21222931. The next prime is 21222959. The reversal of 21222932 is 23922212.

It can be written as a sum of positive squares in only one way, i.e., 19749136 + 1473796 = 4444^2 + 1214^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21222898 and 21222907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652863 + ... + 2652870.

It is an arithmetic number, because the mean of its divisors is an integer number (6190023).

Almost surely, 2^21222932 is an apocalyptic number.

It is an amenable number.

21222932 is a deficient number, since it is larger than the sum of its proper divisors (15917206).

21222932 is a wasteful number, since it uses less digits than its factorization.

21222932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305737 (or 5305735 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 21222932 is about 4606.8353562939. The cubic root of 21222932 is about 276.8652570088.

The spelling of 21222932 in words is "twenty-one million, two hundred twenty-two thousand, nine hundred thirty-two".