421212413440 has 160 divisors (see below), whose sum is σ = 1242982319040. Its totient is φ = 133306712064.

The previous prime is 421212413411. The next prime is 421212413443. The reversal of 421212413440 is 44314212124.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 421212413399 and 421212413408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421212413443) 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, 671085 + ... + 1137004.

It is an arithmetic number, because the mean of its divisors is an integer number (7768639494).

Almost surely, 2^421212413440 is an apocalyptic number.

421212413440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421212413440 is an abundant number, since it is smaller than the sum of its proper divisors (821769905600).

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

421212413440 is a wasteful number, since it uses less digits than its factorization.

421212413440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808132 (or 1808116 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 421212413440 its reverse (44314212124), we get a palindrome (465526625564).

The spelling of 421212413440 in words is "four hundred twenty-one billion, two hundred twelve million, four hundred thirteen thousand, four hundred forty".