21063122 has 4 divisors (see below), whose sum is σ = 31594686. Its totient is φ = 10531560.

The previous prime is 21063121. The next prime is 21063131. The reversal of 21063122 is 22136012.

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

It can be written as a sum of positive squares in only one way, i.e., 17380561 + 3682561 = 4169^2 + 1919^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21063122.

It is not an unprimeable number, because it can be changed into a prime (21063121) 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, 5265779 + ... + 5265782.

Almost surely, 2^21063122 is an apocalyptic number.

21063122 is a deficient number, since it is larger than the sum of its proper divisors (10531564).

21063122 is a wasteful number, since it uses less digits than its factorization.

21063122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10531563.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21063122 is about 4589.4577021692. The cubic root of 21063122 is about 276.1685678232.

Adding to 21063122 its reverse (22136012), we get a palindrome (43199134).

The spelling of 21063122 in words is "twenty-one million, sixty-three thousand, one hundred twenty-two".