21275053 has 2 divisors, whose sum is σ = 21275054. Its totient is φ = 21275052.

The previous prime is 21275039. The next prime is 21275057. The reversal of 21275053 is 35057212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20958084 + 316969 = 4578^2 + 563^2 .

It is a cyclic number.

It is not a de Polignac number, because 21275053 - 2¹⁷ = 21143981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21275057) 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, 10637526 + 10637527.

It is an arithmetic number, because the mean of its divisors is an integer number (10637527).

Almost surely, 2^21275053 is an apocalyptic number.

It is an amenable number.

21275053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21275053 is an equidigital number, since it uses as much as digits as its factorization.

21275053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 21275053 is about 4612.4888075745. The cubic root of 21275053 is about 277.0917211147.

The spelling of 21275053 in words is "twenty-one million, two hundred seventy-five thousand, fifty-three".