21802601 has 2 divisors, whose sum is σ = 21802602. Its totient is φ = 21802600.

The previous prime is 21802589. The next prime is 21802607. The reversal of 21802601 is 10620812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21576025 + 226576 = 4645^2 + 476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21802601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21802607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10901300 + 10901301.

It is an arithmetic number, because the mean of its divisors is an integer number (10901301).

Almost surely, 2^21802601 is an apocalyptic number.

It is an amenable number.

21802601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21802601 is an equidigital number, since it uses as much as digits as its factorization.

21802601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21802601 is about 4669.3255401610. The cubic root of 21802601 is about 279.3633537011.

The spelling of 21802601 in words is "twenty-one million, eight hundred two thousand, six hundred one".