424001721 has 64 divisors (see below), whose sum is σ = 694552320. Its totient is φ = 226544640.

The previous prime is 424001687. The next prime is 424001741. The reversal of 424001721 is 127100424.

It is a happy number.

It is not a de Polignac number, because 424001721 - 2⁹ = 424001209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (424001741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2152195 + ... + 2152391.

It is an arithmetic number, because the mean of its divisors is an integer number (10852380).

Almost surely, 2^424001721 is an apocalyptic number.

It is an amenable number.

424001721 is a deficient number, since it is larger than the sum of its proper divisors (270550599).

424001721 is a wasteful number, since it uses less digits than its factorization.

424001721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 424001721 is about 20591.3020715058. The cubic root of 424001721 is about 751.2581672843.

The spelling of 424001721 in words is "four hundred twenty-four million, one thousand, seven hundred twenty-one".