421636477 has 2 divisors, whose sum is σ = 421636478. Its totient is φ = 421636476.

The previous prime is 421636451. The next prime is 421636517. The reversal of 421636477 is 774636124.

It is an a-pointer prime, because the next prime (421636517) can be obtained adding 421636477 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406183716 + 15452761 = 20154^2 + 3931^2 .

It is a cyclic number.

It is not a de Polignac number, because 421636477 - 2¹¹ = 421634429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421636417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210818238 + 210818239.

It is an arithmetic number, because the mean of its divisors is an integer number (210818239).

Almost surely, 2^421636477 is an apocalyptic number.

It is an amenable number.

421636477 is a deficient number, since it is larger than the sum of its proper divisors (1).

421636477 is an equidigital number, since it uses as much as digits as its factorization.

421636477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 40.

The square root of 421636477 is about 20533.7886664882. The cubic root of 421636477 is about 749.8586263900.

The spelling of 421636477 in words is "four hundred twenty-one million, six hundred thirty-six thousand, four hundred seventy-seven".