421606534023444 has 384 divisors, whose sum is σ = 1283344837447680. Its totient is φ = 104521955328000.

The previous prime is 421606534023383. The next prime is 421606534023541. The reversal of 421606534023444 is 444320435606124.

It is a super-2 number, since 2×421606534023444² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421606534023393 and 421606534023402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1740091492 + ... + 1740333764.

It is an arithmetic number, because the mean of its divisors is an integer number (3342043847520).

Almost surely, 2^{421606534023444} is an apocalyptic number.

421606534023444 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421606534023444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (641672418723840).

421606534023444 is an abundant number, since it is smaller than the sum of its proper divisors (861738303424236).

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

421606534023444 is a wasteful number, since it uses less digits than its factorization.

421606534023444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243071 (or 243069 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 48.

Adding to 421606534023444 its reverse (444320435606124), we get a palindrome (865926969629568).

The spelling of 421606534023444 in words is "four hundred twenty-one trillion, six hundred six billion, five hundred thirty-four million, twenty-three thousand, four hundred forty-four".