21335801 has 2 divisors, whose sum is σ = 21335802. Its totient is φ = 21335800.

The previous prime is 21335779. The next prime is 21335813. The reversal of 21335801 is 10853312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20611600 + 724201 = 4540^2 + 851^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21335801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21335861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667900 + 10667901.

It is an arithmetic number, because the mean of its divisors is an integer number (10667901).

Almost surely, 2^21335801 is an apocalyptic number.

It is an amenable number.

21335801 is a deficient number, since it is larger than the sum of its proper divisors (1).

21335801 is an equidigital number, since it uses as much as digits as its factorization.

21335801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21335801 is about 4619.0692785452. The cubic root of 21335801 is about 277.3552029811.

The spelling of 21335801 in words is "twenty-one million, three hundred thirty-five thousand, eight hundred one".