21146053 has 2 divisors, whose sum is σ = 21146054. Its totient is φ = 21146052.

The previous prime is 21146033. The next prime is 21146057. The reversal of 21146053 is 35064112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19342404 + 1803649 = 4398^2 + 1343^2 .

It is a cyclic number.

It is not a de Polignac number, because 21146053 - 2²¹ = 19048901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21146057) 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, 10573026 + 10573027.

It is an arithmetic number, because the mean of its divisors is an integer number (10573027).

Almost surely, 2^21146053 is an apocalyptic number.

It is an amenable number.

21146053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21146053 is an equidigital number, since it uses as much as digits as its factorization.

21146053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21146053 is about 4598.4837718535. The cubic root of 21146053 is about 276.5305423807.

It can be divided in two parts, 211 and 46053, that added together give a palindrome (46264).

The spelling of 21146053 in words is "twenty-one million, one hundred forty-six thousand, fifty-three".