421001221344 has 96 divisors (see below), whose sum is σ = 1258011627264. Its totient is φ = 122029332480.

The previous prime is 421001221343. The next prime is 421001221351. The reversal of 421001221344 is 443122100124.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421001221343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8642569 + ... + 8691144.

It is an arithmetic number, because the mean of its divisors is an integer number (13104287784).

Almost surely, 2^421001221344 is an apocalyptic number.

421001221344 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

421001221344 is an abundant number, since it is smaller than the sum of its proper divisors (837010405920).

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

421001221344 is a wasteful number, since it uses less digits than its factorization.

421001221344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17333760 (or 17333752 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 421001221344 its reverse (443122100124), we get a palindrome (864123321468).

The spelling of 421001221344 in words is "four hundred twenty-one billion, one million, two hundred twenty-one thousand, three hundred forty-four".