21224053 has 2 divisors, whose sum is σ = 21224054. Its totient is φ = 21224052.

The previous prime is 21224023. The next prime is 21224081. The reversal of 21224053 is 35042212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15038884 + 6185169 = 3878^2 + 2487^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21224053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21224053.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21224003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612026 + 10612027.

It is an arithmetic number, because the mean of its divisors is an integer number (10612027).

Almost surely, 2^21224053 is an apocalyptic number.

It is an amenable number.

21224053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224053 is an equidigital number, since it uses as much as digits as its factorization.

21224053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21224053 is about 4606.9570217227. The cubic root of 21224053 is about 276.8701316178.

Adding to 21224053 its reverse (35042212), we get a palindrome (56266265).

The spelling of 21224053 in words is "twenty-one million, two hundred twenty-four thousand, fifty-three".