100420427 has 2 divisors, whose sum is σ = 100420428. Its totient is φ = 100420426.

The previous prime is 100420423. The next prime is 100420447. The reversal of 100420427 is 724024001.

It is an a-pointer prime, because the next prime (100420447) can be obtained adding 100420427 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100420427 - 2² = 100420423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100420399 and 100420408.

It is not a weakly prime, because it can be changed into another prime (100420421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50210213 + 50210214.

It is an arithmetic number, because the mean of its divisors is an integer number (50210214).

Almost surely, 2^100420427 is an apocalyptic number.

100420427 is a deficient number, since it is larger than the sum of its proper divisors (1).

100420427 is an equidigital number, since it uses as much as digits as its factorization.

100420427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 100420427 is about 10020.9993014669. Note that the first 3 decimals coincide. The cubic root of 100420427 is about 464.8084569719.

Adding to 100420427 its reverse (724024001), we get a palindrome (824444428).

The spelling of 100420427 in words is "one hundred million, four hundred twenty thousand, four hundred twenty-seven".