421007773 has 2 divisors, whose sum is σ = 421007774. Its totient is φ = 421007772.

The previous prime is 421007767. The next prime is 421007809. The reversal of 421007773 is 377700124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 298529284 + 122478489 = 17278^2 + 11067^2 .

It is a cyclic number.

It is not a de Polignac number, because 421007773 - 2¹³ = 420999581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421007173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210503886 + 210503887.

It is an arithmetic number, because the mean of its divisors is an integer number (210503887).

Almost surely, 2^421007773 is an apocalyptic number.

It is an amenable number.

421007773 is a deficient number, since it is larger than the sum of its proper divisors (1).

421007773 is an equidigital number, since it uses as much as digits as its factorization.

421007773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 421007773 is about 20518.4739442289. The cubic root of 421007773 is about 749.4857351599.

Adding to 421007773 its reverse (377700124), we get a palindrome (798707897).

The spelling of 421007773 in words is "four hundred twenty-one million, seven thousand, seven hundred seventy-three".