21187701203 has 2 divisors, whose sum is σ = 21187701204. Its totient is φ = 21187701202.

The previous prime is 21187701167. The next prime is 21187701289. The reversal of 21187701203 is 30210778112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21187701203 - 2²⁸ = 20919265747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21187701203.

It is not a weakly prime, because it can be changed into another prime (21187701503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10593850601 + 10593850602.

It is an arithmetic number, because the mean of its divisors is an integer number (10593850602).

Almost surely, 2^21187701203 is an apocalyptic number.

21187701203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21187701203 is an equidigital number, since it uses as much as digits as its factorization.

21187701203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The spelling of 21187701203 in words is "twenty-one billion, one hundred eighty-seven million, seven hundred one thousand, two hundred three".