426721415621 has 16 divisors (see below), whose sum is σ = 457379440128. Its totient is φ = 397075536000.

The previous prime is 426721415557. The next prime is 426721415629. The reversal of 426721415621 is 126514127624.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 426721415621 - 2⁶ = 426721415557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426721415629) 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 in 15 ways as a sum of consecutive naturals, for example, 6050441 + ... + 6120561.

It is an arithmetic number, because the mean of its divisors is an integer number (28586215008).

Almost surely, 2^426721415621 is an apocalyptic number.

It is an amenable number.

426721415621 is a deficient number, since it is larger than the sum of its proper divisors (30658024507).

426721415621 is a wasteful number, since it uses less digits than its factorization.

426721415621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77332.

The product of its digits is 161280, while the sum is 41.

The spelling of 426721415621 in words is "four hundred twenty-six billion, seven hundred twenty-one million, four hundred fifteen thousand, six hundred twenty-one".