21301801 has 2 divisors, whose sum is σ = 21301802. Its totient is φ = 21301800.

The previous prime is 21301783. The next prime is 21301823. The reversal of 21301801 is 10810312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20693401 + 608400 = 4549^2 + 780^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301801 - 2⁵ = 21301769 is a prime.

It is not a weakly prime, because it can be changed into another prime (21301201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650900 + 10650901.

It is an arithmetic number, because the mean of its divisors is an integer number (10650901).

Almost surely, 2^21301801 is an apocalyptic number.

It is an amenable number.

21301801 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301801 is an equidigital number, since it uses as much as digits as its factorization.

21301801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 21301801 is about 4615.3874160248. The cubic root of 21301801 is about 277.2077967430.

The spelling of 21301801 in words is "twenty-one million, three hundred one thousand, eight hundred one".