21150653 has 2 divisors, whose sum is σ = 21150654. Its totient is φ = 21150652.

The previous prime is 21150637. The next prime is 21150659. The reversal of 21150653 is 35605112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11682724 + 9467929 = 3418^2 + 3077^2 .

It is a cyclic number.

It is not a de Polignac number, because 21150653 - 2⁴ = 21150637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21150659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575326 + 10575327.

It is an arithmetic number, because the mean of its divisors is an integer number (10575327).

Almost surely, 2^21150653 is an apocalyptic number.

It is an amenable number.

21150653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150653 is an equidigital number, since it uses as much as digits as its factorization.

21150653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 21150653 is about 4598.9839095174. The cubic root of 21150653 is about 276.5505925885.

Adding to 21150653 its reverse (35605112), we get a palindrome (56755765).

The spelling of 21150653 in words is "twenty-one million, one hundred fifty thousand, six hundred fifty-three".