421694381522 has 6 divisors (see below), whose sum is σ = 632542949829. Its totient is φ = 210846731580.

The previous prime is 421694381513. The next prime is 421694381533. The reversal of 421694381522 is 225183496124.

It can be written as a sum of positive squares in 2 ways, for example, as 353348213761 + 68346167761 = 594431^2 + 261431^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=459181.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 688772 + ... + 1147952.

Almost surely, 2^421694381522 is an apocalyptic number.

421694381522 is a deficient number, since it is larger than the sum of its proper divisors (210848568307).

421694381522 is an frugal number, since it uses more digits than its factorization.

421694381522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918364 (or 459183 counting only the distinct ones).

The product of its digits is 829440, while the sum is 47.

The spelling of 421694381522 in words is "four hundred twenty-one billion, six hundred ninety-four million, three hundred eighty-one thousand, five hundred twenty-two".