421984501 has 2 divisors, whose sum is σ = 421984502. Its totient is φ = 421984500.

The previous prime is 421984439. The next prime is 421984517. The reversal of 421984501 is 105489124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 364619025 + 57365476 = 19095^2 + 7574^2 .

It is a cyclic number.

It is not a de Polignac number, because 421984501 - 2⁷ = 421984373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421984531) 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, 210992250 + 210992251.

It is an arithmetic number, because the mean of its divisors is an integer number (210992251).

Almost surely, 2^421984501 is an apocalyptic number.

It is an amenable number.

421984501 is a deficient number, since it is larger than the sum of its proper divisors (1).

421984501 is an equidigital number, since it uses as much as digits as its factorization.

421984501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 421984501 is about 20542.2613409527. The cubic root of 421984501 is about 750.0648838681.

The spelling of 421984501 in words is "four hundred twenty-one million, nine hundred eighty-four thousand, five hundred one".