21222052 has 12 divisors (see below), whose sum is σ = 39323340. Its totient is φ = 9986816.

The previous prime is 21222043. The next prime is 21222143. The reversal of 21222052 is 25022212.

It can be written as a sum of positive squares in 2 ways, for example, as 9278116 + 11943936 = 3046^2 + 3456^2 .

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 155977 + ... + 156112.

It is an arithmetic number, because the mean of its divisors is an integer number (3276945).

Almost surely, 2^21222052 is an apocalyptic number.

It is an amenable number.

21222052 is a deficient number, since it is larger than the sum of its proper divisors (18101288).

21222052 is a wasteful number, since it uses less digits than its factorization.

21222052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312110 (or 312108 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 21222052 is about 4606.7398450531. The cubic root of 21222052 is about 276.8614302552.

Adding to 21222052 its product of nonzero digits (160), we get a palindrome (21222212).

Adding to 21222052 its reverse (25022212), we get a palindrome (46244264).

The spelling of 21222052 in words is "twenty-one million, two hundred twenty-two thousand, fifty-two".