421221605712 has 80 divisors (see below), whose sum is σ = 1109648263680. Its totient is φ = 137656086400.

The previous prime is 421221605689. The next prime is 421221605767. The reversal of 421221605712 is 217506122124.

It is a super-2 number, since 2×421221605712² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264787 + ... + 955277.

It is an arithmetic number, because the mean of its divisors is an integer number (13870603296).

Almost surely, 2^421221605712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421221605712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (554824131840).

421221605712 is an abundant number, since it is smaller than the sum of its proper divisors (688426657968).

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

421221605712 is a wasteful number, since it uses less digits than its factorization.

421221605712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690752 (or 690746 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

Adding to 421221605712 its reverse (217506122124), we get a palindrome (638727727836).

The spelling of 421221605712 in words is "four hundred twenty-one billion, two hundred twenty-one million, six hundred five thousand, seven hundred twelve".