21830071 has 2 divisors, whose sum is σ = 21830072. Its totient is φ = 21830070.

The previous prime is 21830063. The next prime is 21830087. The reversal of 21830071 is 17003812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21830071 - 2³ = 21830063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21830041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10915035 + 10915036.

It is an arithmetic number, because the mean of its divisors is an integer number (10915036).

Almost surely, 2^21830071 is an apocalyptic number.

21830071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21830071 is an equidigital number, since it uses as much as digits as its factorization.

21830071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21830071 is about 4672.2661525217. The cubic root of 21830071 is about 279.4806316137.

Adding to 21830071 its reverse (17003812), we get a palindrome (38833883).

The spelling of 21830071 in words is "twenty-one million, eight hundred thirty thousand, seventy-one".