421064621 has 2 divisors, whose sum is σ = 421064622. Its totient is φ = 421064620.

The previous prime is 421064597. The next prime is 421064647. The reversal of 421064621 is 126460124.

It is an a-pointer prime, because the next prime (421064647) can be obtained adding 421064621 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 407595721 + 13468900 = 20189^2 + 3670^2 .

It is a cyclic number.

It is not a de Polignac number, because 421064621 - 2¹⁰ = 421063597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421064671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210532310 + 210532311.

It is an arithmetic number, because the mean of its divisors is an integer number (210532311).

Almost surely, 2^421064621 is an apocalyptic number.

It is an amenable number.

421064621 is a deficient number, since it is larger than the sum of its proper divisors (1).

421064621 is an equidigital number, since it uses as much as digits as its factorization.

421064621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 421064621 is about 20519.8591856767. The cubic root of 421064621 is about 749.5194675913.

The spelling of 421064621 in words is "four hundred twenty-one million, sixty-four thousand, six hundred twenty-one".