21046873 has 2 divisors, whose sum is σ = 21046874. Its totient is φ = 21046872.

The previous prime is 21046859. The next prime is 21046877. The reversal of 21046873 is 37864012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15272464 + 5774409 = 3908^2 + 2403^2 .

It is a cyclic number.

It is not a de Polignac number, because 21046873 - 2⁵ = 21046841 is a prime.

It is not a weakly prime, because it can be changed into another prime (21046877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10523436 + 10523437.

It is an arithmetic number, because the mean of its divisors is an integer number (10523437).

Almost surely, 2^21046873 is an apocalyptic number.

It is an amenable number.

21046873 is a deficient number, since it is larger than the sum of its proper divisors (1).

21046873 is an equidigital number, since it uses as much as digits as its factorization.

21046873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21046873 is about 4587.6871079009. The cubic root of 21046873 is about 276.0975334423.

The spelling of 21046873 in words is "twenty-one million, forty-six thousand, eight hundred seventy-three".