420021827 has 2 divisors, whose sum is σ = 420021828. Its totient is φ = 420021826.

The previous prime is 420021803. The next prime is 420021829. The reversal of 420021827 is 728120024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420021827 - 2²⁰ = 418973251 is a prime.

Together with 420021829, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 420021796 and 420021805.

It is not a weakly prime, because it can be changed into another prime (420021829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210010913 + 210010914.

It is an arithmetic number, because the mean of its divisors is an integer number (210010914).

Almost surely, 2^420021827 is an apocalyptic number.

420021827 is a deficient number, since it is larger than the sum of its proper divisors (1).

420021827 is an equidigital number, since it uses as much as digits as its factorization.

420021827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 420021827 is about 20494.4340492730. The cubic root of 420021827 is about 748.9002114826.

The spelling of 420021827 in words is "four hundred twenty million, twenty-one thousand, eight hundred twenty-seven".