21030166303 has 2 divisors, whose sum is σ = 21030166304. Its totient is φ = 21030166302.

The previous prime is 21030166279. The next prime is 21030166331. The reversal of 21030166303 is 30366103012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21030166303 - 2¹³ = 21030158111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030166603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515083151 + 10515083152.

It is an arithmetic number, because the mean of its divisors is an integer number (10515083152).

Almost surely, 2^21030166303 is an apocalyptic number.

21030166303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030166303 is an equidigital number, since it uses as much as digits as its factorization.

21030166303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 21030166303 its reverse (30366103012), we get a palindrome (51396269315).

The spelling of 21030166303 in words is "twenty-one billion, thirty million, one hundred sixty-six thousand, three hundred three".