21198701 has 2 divisors, whose sum is σ = 21198702. Its totient is φ = 21198700.

The previous prime is 21198679. The next prime is 21198719. The reversal of 21198701 is 10789112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20484676 + 714025 = 4526^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 21198701 - 2¹⁰ = 21197677 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21198721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10599350 + 10599351.

It is an arithmetic number, because the mean of its divisors is an integer number (10599351).

Almost surely, 2^21198701 is an apocalyptic number.

It is an amenable number.

21198701 is a deficient number, since it is larger than the sum of its proper divisors (1).

21198701 is an equidigital number, since it uses as much as digits as its factorization.

21198701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 21198701 is about 4604.2047087418. The cubic root of 21198701 is about 276.7598478086.

The spelling of 21198701 in words is "twenty-one million, one hundred ninety-eight thousand, seven hundred one".