21221162 has 4 divisors (see below), whose sum is σ = 31831746. Its totient is φ = 10610580.

The previous prime is 21221153. The next prime is 21221171. The reversal of 21221162 is 26112212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21221153) and next prime (21221171).

It can be written as a sum of positive squares in only one way, i.e., 18913801 + 2307361 = 4349^2 + 1519^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21221162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305289 + ... + 5305292.

Almost surely, 2^21221162 is an apocalyptic number.

21221162 is a deficient number, since it is larger than the sum of its proper divisors (10610584).

21221162 is a wasteful number, since it uses less digits than its factorization.

21221162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610583.

The product of its digits is 96, while the sum is 17.

The square root of 21221162 is about 4606.6432464431. The cubic root of 21221162 is about 276.8575599082.

Adding to 21221162 its reverse (26112212), we get a palindrome (47333374).

The spelling of 21221162 in words is "twenty-one million, two hundred twenty-one thousand, one hundred sixty-two".