424721321646 has 16 divisors (see below), whose sum is σ = 849481294800. Its totient is φ = 141567331968.

The previous prime is 424721321641. The next prime is 424721321653. The reversal of 424721321646 is 646123127424.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 424721321598 and 424721321607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424721321641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1466641 + ... + 1732188.

It is an arithmetic number, because the mean of its divisors is an integer number (53092580925).

Almost surely, 2^424721321646 is an apocalyptic number.

424721321646 is an abundant number, since it is smaller than the sum of its proper divisors (424759973154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

424721321646 is a wasteful number, since it uses less digits than its factorization.

424721321646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220963.

The product of its digits is 387072, while the sum is 42.

The spelling of 424721321646 in words is "four hundred twenty-four billion, seven hundred twenty-one million, three hundred twenty-one thousand, six hundred forty-six".