21059870803 has 2 divisors, whose sum is σ = 21059870804. Its totient is φ = 21059870802.

The previous prime is 21059870753. The next prime is 21059870879. The reversal of 21059870803 is 30807895012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21059870803 is a prime.

It is a super-3 number, since 3×21059870803³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21059870803.

It is not a weakly prime, because it can be changed into another prime (21059870203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10529935401 + 10529935402.

It is an arithmetic number, because the mean of its divisors is an integer number (10529935402).

Almost surely, 2^21059870803 is an apocalyptic number.

21059870803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21059870803 is an equidigital number, since it uses as much as digits as its factorization.

21059870803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 21059870803 in words is "twenty-one billion, fifty-nine million, eight hundred seventy thousand, eight hundred three".