21230827 has 2 divisors, whose sum is σ = 21230828. Its totient is φ = 21230826.

The previous prime is 21230801. The next prime is 21230843. The reversal of 21230827 is 72803212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230827 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615413 + 10615414.

It is an arithmetic number, because the mean of its divisors is an integer number (10615414).

Almost surely, 2^21230827 is an apocalyptic number.

21230827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230827 is an equidigital number, since it uses as much as digits as its factorization.

21230827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21230827 is about 4607.6921555156. The cubic root of 21230827 is about 276.8995843457.

The spelling of 21230827 in words is "twenty-one million, two hundred thirty thousand, eight hundred twenty-seven".