421621321634 has 8 divisors (see below), whose sum is σ = 632436268368. Its totient is φ = 210809232180.

The previous prime is 421621321603. The next prime is 421621321651. The reversal of 421621321634 is 436123126124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 421621321594 and 421621321603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296552 + ... + 964979.

It is an arithmetic number, because the mean of its divisors is an integer number (79054533546).

Almost surely, 2^421621321634 is an apocalyptic number.

421621321634 is a deficient number, since it is larger than the sum of its proper divisors (210814946734).

421621321634 is a wasteful number, since it uses less digits than its factorization.

421621321634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428640.

The product of its digits is 41472, while the sum is 35.

Adding to 421621321634 its reverse (436123126124), we get a palindrome (857744447758).

The spelling of 421621321634 in words is "four hundred twenty-one billion, six hundred twenty-one million, three hundred twenty-one thousand, six hundred thirty-four".