21195803 has 2 divisors, whose sum is σ = 21195804. Its totient is φ = 21195802.

The previous prime is 21195799. The next prime is 21195827. The reversal of 21195803 is 30859112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21195803 - 2² = 21195799 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21195883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10597901 + 10597902.

It is an arithmetic number, because the mean of its divisors is an integer number (10597902).

Almost surely, 2^21195803 is an apocalyptic number.

21195803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21195803 is an equidigital number, since it uses as much as digits as its factorization.

21195803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 21195803 is about 4603.8899856534. The cubic root of 21195803 is about 276.7472356115.

The spelling of 21195803 in words is "twenty-one million, one hundred ninety-five thousand, eight hundred three".