21220132 has 6 divisors (see below), whose sum is σ = 37135238. Its totient is φ = 10610064.

The previous prime is 21220109. The next prime is 21220153. The reversal of 21220132 is 23102212.

It can be written as a sum of positive squares in only one way, i.e., 13734436 + 7485696 = 3706^2 + 2736^2 .

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 as a sum of consecutive naturals, namely, 2652513 + ... + 2652520.

Almost surely, 2^21220132 is an apocalyptic number.

It is an amenable number.

21220132 is a deficient number, since it is larger than the sum of its proper divisors (15915106).

21220132 is a wasteful number, since it uses less digits than its factorization.

21220132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305037 (or 5305035 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21220132 is about 4606.5314500175. The cubic root of 21220132 is about 276.8530806074.

Adding to 21220132 its reverse (23102212), we get a palindrome (44322344).

The spelling of 21220132 in words is "twenty-one million, two hundred twenty thousand, one hundred thirty-two".