21295273 has 2 divisors, whose sum is σ = 21295274. Its totient is φ = 21295272.

The previous prime is 21295259. The next prime is 21295289. The reversal of 21295273 is 37259212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13749264 + 7546009 = 3708^2 + 2747^2 .

It is a cyclic number.

It is not a de Polignac number, because 21295273 - 2¹³ = 21287081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21295073) 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, 10647636 + 10647637.

It is an arithmetic number, because the mean of its divisors is an integer number (10647637).

Almost surely, 2^21295273 is an apocalyptic number.

It is an amenable number.

21295273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21295273 is an equidigital number, since it uses as much as digits as its factorization.

21295273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 31.

The square root of 21295273 is about 4614.6801622648. The cubic root of 21295273 is about 277.1794767998.

The spelling of 21295273 in words is "twenty-one million, two hundred ninety-five thousand, two hundred seventy-three".